1. products list

Comparison results

DS725+ DS925+ DS1525+
Hardware Specs
Hardware Specifications
CPU
CPU Model AMD Ryzen R1600 AMD Ryzen V1500B AMD Ryzen V1500B
CPU Quantity 1 1 1
CPU Cores 2 4 4
CPU Threads 4 8 8
CPU Architecture 64-bit 64-bit 64-bit
CPU Frequency 2.6 (base) / 3.1 (turbo) GHz 2.2 GHz 2.2 GHz
Hardware Encryption Engine
Memory
System Memory 4 GB DDR4 ECC SODIMM 4 GB DDR4 ECC SODIMM 8 GB DDR4 ECC SODIMM
Memory Module Pre-installed 4 GB (4 GB × 1) 4 GB (4 GB × 1) 8 GB (8 GB × 1)
Total Memory Slots 2 2 2
Maximum Memory Capacity 32 GB (16 GB x 2) 32 GB (16 GB x 2) 32 GB (16 GB x 2)
Notes
  • Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and performance.
  • Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
  • For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
  • Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and performance.
  • Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
  • For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
  • Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and performance.
  • Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
  • For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
Storage
Drive Bays 2 4 5
Maximum Drive Bays with Expansion Unit 7 (DX525 × 1) 9 (DX525 × 1) 15 (DX525 × 2)
M.2 Drive Slots 2 (NVMe) 2 (NVMe) 2 (NVMe)
Drive Type (See all supported drives)
  • 3.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
  • 3.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
  • 3.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
Hot Swappable Drive*
Notes
  • The hot swappable drive feature is not supported by M.2 SSD slots.
  • Synology only guarantees full functionality, reliability, and performance for compatible drives. Please consult our compatibility list before purchasing hard drives. For more details, please refer to this article.
  • The hot swappable drive feature is not supported by M.2 SSD slots.
  • Synology only guarantees full functionality, reliability, and performance for compatible drives. Please consult our compatibility list before purchasing hard drives. For more details, please refer to this article.
  • The hot swappable drive feature is not supported by M.2 SSD slots.
  • Synology only guarantees full functionality, reliability, and performance for compatible drives. Please consult our compatibility list before purchasing hard drives. For more details, please refer to this article.
External Ports
RJ-45 1GbE LAN Port 1
RJ-45 2.5GbE LAN Port 1 2 2
USB 3.2 Gen 1 Port 1 2 2
Expansion Port 1 1 2
Expansion Port Type USB Type-C USB Type-C USB Type-C
Notes This device's 1GbE LAN ports have a maximum transmission unit (MTU) size of 1,500 bytes.
PCIe
PCIe Expansion 1 x Gen3 x2 network upgrade slot
Appearance
Size (Height x Width x Depth) 166 mm × 106 mm × 223 mm 166 mm × 199 mm × 223 mm 166 mm × 230 mm × 223 mm
Weight 1.51 kg 2.26 kg 2.67 kg
Others
System Fan 92 mm × 92 mm × 1 pcs 92 mm × 92 mm × 2 pcs 92 mm × 92 mm × 2 pcs
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Brightness Adjustable Front LED Indicators
Power Recovery
Noise Level 17.9 dB(A) 20.5 dB(A) 22.60 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 65 watts 100 watts
120 watts*		 120 watts
AC Input Power Voltage 100V to 240V AC 100V to 240V AC 100V to 240V AC
Power Frequency 50/60 Hz, Single Phase 50/60 Hz, Single Phase 50/60 Hz, Single Phase
Power Consumption 20.41 watts (Access)
7.87 watts (HDD Hibernation)		 37.91 watts (Access)
12.33 watts (HDD Hibernation)		 44.56 watts (Access)
13.63 watts (HDD Hibernation)
British Thermal Unit 69.61 BTU/hr (Access)
26.84 BTU/hr (HDD Hibernation)		 129.27 BTU/hr (Access)
42.05 BTU/hr (HDD Hibernation)		 151.95 BTU/hr (Access)
46.48 BTU/hr (HDD Hibernation)
Notes
  • For more information on how power consumption is measured, refer to this article.
  • Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two G.R.A.S. Type 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
  • For more information on how power consumption is measured, refer to this article.
  • Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two G.R.A.S. Type 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
  • For more information on how power consumption is measured, refer to this article.
  • Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two G.R.A.S. Type 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
Temperature
Operating Temperature 0°C to 40°C (32°F to 104°F) 0°C to 40°C (32°F to 104°F) 0°C to 40°C (32°F to 104°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F) -20°C to 60°C (-5°F to 140°F) -20°C to 60°C (-5°F to 140°F)
Operating Humidity 8% to 80% RH 8% to 80% RH 8% to 80% RH
Storage Humidity 5% to 95% RH 5% to 95% RH 5% to 95% RH
Certification
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • CCC
  • KC
  • BIS
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • CCC
  • KC
  • BIS
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • CCC
  • KC
  • BIS
Warranty 3-year hardware warranty, extendable to 5 years with EW201 or Extended Warranty Plus 3-year hardware warranty, extendable to 5 years with EW201 or Extended Warranty Plus 3-year hardware warranty, extendable to 5 years with EW201 or Extended Warranty Plus
Notes
  • The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
  • Extended Warranty Plus is only available in Europe and North America. EW201/EW202 is only available in Asia, Africa, and Oceania. For exact availability information please visit their respective websites.
  • The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
  • Extended Warranty Plus is only available in Europe and North America. EW201/EW202 is only available in Asia, Africa, and Oceania. For exact availability information please visit their respective websites.
  • The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
  • Extended Warranty Plus is only available in Europe and North America. EW201/EW202 is only available in Asia, Africa, and Oceania. For exact availability information please visit their respective websites.
Environment RoHS Compliant RoHS Compliant RoHS Compliant
Packaging Content
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
Optional Accessories
Notes For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations. For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations. For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
Software Specs
DSM Specifications
Storage Management
Maximum Single Volume Size
  • 200 TB (32 GB memory required)
  • 108 TB
  • 200 TB (32 GB memory required)
  • 108 TB
  • 200 TB (32 GB memory required)
  • 108 TB
Maximum Internal Volume Number 32 32 32
M.2 SSD Storage Pool Support*
SSD Read/Write Cache (Determining cache size)
SSD TRIM
Supported RAID Type
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RAID Migration
  • Basic to RAID 1
  • Basic to RAID 5 (with Expansion Unit)
  • RAID 1 to RAID 5 (with Expansion Unit)
  • RAID 5 to RAID 6 (with Expansion Unit)
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
Volume Expansion with Larger HDDs
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Volume Expansion by Adding a HDD
  • Synology Hybrid RAID (with Expansion Unit)
  • JBOD (with Expansion Unit)
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6 (with Expansion Unit)
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6
Global Hot Spare Supported RAID Type
  • Synology Hybrid RAID (with Expansion Unit)
  • RAID 1 (with Expansion Unit)
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Notes
  • Volumes over 108 TB require 32 GB of memory or more.
  • Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration.
  • Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored.
  • Creating M.2 storage pools requires the use of Synology-verified SSDs, which are rigorously tested under extreme temperature conditions. Thermal parameters for SSDs and NAS units are fine-tuned to ensure optimal management of thermal conditions under I/O-intensive environments. (Learn more)
  • Volumes over 108 TB require 32 GB of memory or more.
  • Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration.
  • Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored.
  • Creating M.2 storage pools requires the use of Synology-verified SSDs, which are rigorously tested under extreme temperature conditions. Thermal parameters for SSDs and NAS units are fine-tuned to ensure optimal management of thermal conditions under I/O-intensive environments. (Learn more)
  • Volumes over 108 TB require 32 GB of memory or more.
  • Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration.
  • Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored.
  • Creating M.2 storage pools requires the use of Synology-verified SSDs, which are rigorously tested under extreme temperature conditions. Thermal parameters for SSDs and NAS units are fine-tuned to ensure optimal management of thermal conditions under I/O-intensive environments. (Learn more)
File System
Internal Drives
  • Btrfs
  • ext4
  • Btrfs
  • ext4
  • Btrfs
  • ext4
External Drives
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
File Services
File Protocol
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
Maximum Number of SMB Connections (FSCT-Based) 30 40 40
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Notes
  • Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration:
    • Test workload: HomeFolder scenario provided by the FSCT tool
    • Test duration: 600 seconds
    • Domain controller & FSCT controller: Windows Server 2022
    • FSCT clients: 8 × Windows 10 machines
    • SMB feature: Directory leasing enabled
  • Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration:
    • Test workload: HomeFolder scenario provided by the FSCT tool
    • Test duration: 600 seconds
    • Domain controller & FSCT controller: Windows Server 2022
    • FSCT clients: 8 × Windows 10 machines
    • SMB feature: Directory leasing enabled
  • Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration:
    • Test workload: HomeFolder scenario provided by the FSCT tool
    • Test duration: 600 seconds
    • Domain controller & FSCT controller: Windows Server 2022
    • FSCT clients: 8 × Windows 10 machines
    • SMB feature: Directory leasing enabled
Account & Shared Folder
Maximum Local User Accounts 512 512 1,024
Maximum Local Groups 128 128 256
Maximum Shared Folder 128 128 256
Maximum Shared Folder Sync Tasks 4 4 8
Hybrid Share
Maximum Hybrid Share Folders 10 10 10
Hyper Backup
Folder and Package Backup
Entire System Backup
High Availability
Synology High Availability
Log Center
Syslog Events per Second 800 800 800
Virtualization
VMware vSphere ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5 ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5 ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5
Microsoft Hyper-V Windows Server 2022 Windows Server 2022 Windows Server 2022
Citrix XenServer XenServer 8, Citrix Hypervisor 8.2 LTSR CU1 XenServer 8.4, XenServer 8, Citrix Hypervisor 8.2 LTSR CU1 XenServer 8.4, XenServer 8, Citrix Hypervisor 8.2 LTSR CU1
OpenStack Cinder Cinder Cinder
General Specifications
Supported Protocols SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
  • Chrome
  • Firefox
  • Edge
  • Safari
  • Chrome
  • Firefox
  • Edge
  • Safari
  • Chrome
  • Firefox
  • Edge
  • Safari
Supported Language English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文 English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文 English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
Notes For an updated list of supported browser versions, check the DSM Technical Specifications. For an updated list of supported browser versions, check the DSM Technical Specifications. For an updated list of supported browser versions, check the DSM Technical Specifications.
Add-on Packages view the complete package list
Central Management System
Synology AI Console
Third-Party AI Model Integration
Maximum De-Identification Rate 30 words per second 40 words per second 40 words per second
Notes
  • De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text.
  • To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.
  • De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text.
  • To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.
  • De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text.
  • To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.
Synology Chat
Maximum Number of Users 100 150 150
Notes
  • Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
  • Models with expandable memory are tested with the maximum supported quantity installed.
Download Station
Maximum Concurrent Download Tasks 80 80 80
SAN Manager
Maximum iSCSI Target Number 32 32 64
Maximum LUN 64 64 128
LUN Clone/Snapshot, Windows ODX
Synology MailPlus / MailPlus Server
Free Email Accounts 5 (Additional accounts require purchase of licenses) 5 (Additional accounts require purchase of licenses) 5 (Additional accounts require purchase of licenses)
Maximum Number of Users 60 90 100
Notes
  • The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements.
  • Operating in high-availability mode will incur additional overhead.
  • Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).
  • The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements.
  • Operating in high-availability mode will incur additional overhead.
  • Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).
  • The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements.
  • Operating in high-availability mode will incur additional overhead.
  • Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).
Media Server
DLNA Compliance
Synology Photos
Facial Recognition
Object Recognition
Snapshot Replication
Maximum Snapshots per Shared Folder 256 256 256
Maximum Snapshots per LUN 32 32 64
Maximum Snapshots per System 2,048 2,048 4,096
Maximum Replication Tasks for Shared Folders 32 32 32
Maximum Replication Tasks for LUNs 16 16 16
Maximum Replication Tasks per System 32 32 32
Surveillance Station
Default Licenses 2 (Additional cameras require purchase of licenses) 2 (Additional cameras require purchase of licenses) 2 (Additional cameras require purchase of licenses)
Maximum IP Cameras and Total FPS (H.264)
  • 1080p: 40 channels, 800 FPS
  • 3M: 35 channels, 350 FPS
  • 5M: 28 channels, 280 FPS
  • 4K: 17 channels, 170 FPS
  • 1080p: 40 channels, 1050 FPS
  • 3M: 40 channels, 600 FPS
  • 5M: 30 channels, 360 FPS
  • 4K: 20 channels, 200 FPS
  • 1080p: 40 channels, 1050 FPS
  • 3M: 40 channels, 600 FPS
  • 5M: 30 channels, 360 FPS
  • 4K: 20 channels, 200 FPS
Maximum IP Cameras and Total FPS (H.265)
  • 1080p: 40 channels, 1200 FPS
  • 3M: 40 channels, 600 FPS
  • 5M: 40 channels, 480 FPS
  • 4K: 20 channels, 200 FPS
  • 1080p: 40 channels, 1200 FPS
  • 3M: 40 channels, 1000 FPS
  • 5M: 40 channels, 600 FPS
  • 4K: 30 channels, 300 FPS
  • 1080p: 40 channels, 1200 FPS
  • 3M: 40 channels, 1000 FPS
  • 5M: 40 channels, 600 FPS
  • 4K: 30 channels, 300 FPS
Notes
  • Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads.
  • Use NVR Selector to quickly find a suitable model based on your requirements.
  • The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution.
  • The values above are based on testing with RTSP streaming. If SRTP is enabled for all cameras, overall performance will decrease to 70% of the stated figures.
  • Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads.
  • Use NVR Selector to quickly find a suitable model based on your requirements.
  • The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution.
  • The values above are based on testing with RTSP streaming. If SRTP is enabled for all cameras, overall performance will decrease to 70% of the stated figures.
  • Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads.
  • Use NVR Selector to quickly find a suitable model based on your requirements.
  • The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution.
  • The values above are based on testing with RTSP streaming. If SRTP is enabled for all cameras, overall performance will decrease to 70% of the stated figures.
Synology Drive
Maximum Number of Users 50 80 80
Maximum Number of Hosted Files 500,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) 500,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) 500,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Notes
  • The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
  • The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
  • The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
Synology Office
Maximum Number of Users 50 80 80
Notes
  • The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
  • The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
  • The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
Virtual Machine Manager
Recommended Virtual Machine Instances 4 (Learn more) 8 (Learn more) 8 (Learn more)
Recommended Virtual DSM Number (Licenses required) 4 (including 1 Free License) 8 (including 1 Free License) 8 (including 1 Free License)
Notes The specifications vary depending on system configuration and memory size. The specifications vary depending on system configuration and memory size. The specifications vary depending on system configuration and memory size.
VPN Server
Maximum Connections 8 8 8
Hardware Specs
Hardware Specifications
CPU
CPU Model
DS725+ AMD Ryzen R1600
DS925+ AMD Ryzen V1500B
DS1525+ AMD Ryzen V1500B
CPU Quantity
DS725+ 1
DS925+ 1
DS1525+ 1
CPU Cores
DS725+ 2
DS925+ 4
DS1525+ 4
CPU Threads
DS725+ 4
DS925+ 8
DS1525+ 8
CPU Architecture
DS725+ 64-bit
DS925+ 64-bit
DS1525+ 64-bit
CPU Frequency
DS725+ 2.6 (base) / 3.1 (turbo) GHz
DS925+ 2.2 GHz
DS1525+ 2.2 GHz
Hardware Encryption Engine
DS725+
DS925+
DS1525+
Memory
System Memory
DS725+ 4 GB DDR4 ECC SODIMM
DS925+ 4 GB DDR4 ECC SODIMM
DS1525+ 8 GB DDR4 ECC SODIMM
Memory Module Pre-installed
DS725+ 4 GB (4 GB × 1)
DS925+ 4 GB (4 GB × 1)
DS1525+ 8 GB (8 GB × 1)
Total Memory Slots
DS725+ 2
DS925+ 2
DS1525+ 2
Maximum Memory Capacity
DS725+ 32 GB (16 GB x 2)
DS925+ 32 GB (16 GB x 2)
DS1525+ 32 GB (16 GB x 2)
Notes
DS725+
  • Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and performance.
  • Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
  • For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
DS925+
  • Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and performance.
  • Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
  • For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
DS1525+
  • Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and performance.
  • Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
  • For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
Storage
Drive Bays
DS725+ 2
DS925+ 4
DS1525+ 5
Maximum Drive Bays with Expansion Unit
DS725+ 7 (DX525 × 1)
DS925+ 9 (DX525 × 1)
DS1525+ 15 (DX525 × 2)
M.2 Drive Slots
DS725+ 2 (NVMe)
DS925+ 2 (NVMe)
DS1525+ 2 (NVMe)
Drive Type (See all supported drives)
DS725+
  • 3.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
DS925+
  • 3.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
DS1525+
  • 3.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
Hot Swappable Drive*
DS725+
DS925+
DS1525+
Notes
DS725+
  • The hot swappable drive feature is not supported by M.2 SSD slots.
  • Synology only guarantees full functionality, reliability, and performance for compatible drives. Please consult our compatibility list before purchasing hard drives. For more details, please refer to this article.
DS925+
  • The hot swappable drive feature is not supported by M.2 SSD slots.
  • Synology only guarantees full functionality, reliability, and performance for compatible drives. Please consult our compatibility list before purchasing hard drives. For more details, please refer to this article.
DS1525+
  • The hot swappable drive feature is not supported by M.2 SSD slots.
  • Synology only guarantees full functionality, reliability, and performance for compatible drives. Please consult our compatibility list before purchasing hard drives. For more details, please refer to this article.
External Ports
RJ-45 1GbE LAN Port
DS725+ 1
DS925+
DS1525+
RJ-45 2.5GbE LAN Port
DS725+ 1
DS925+ 2
DS1525+ 2
USB 3.2 Gen 1 Port
DS725+ 1
DS925+ 2
DS1525+ 2
Expansion Port
DS725+ 1
DS925+ 1
DS1525+ 2
Expansion Port Type
DS725+ USB Type-C
DS925+ USB Type-C
DS1525+ USB Type-C
Notes
DS725+ This device's 1GbE LAN ports have a maximum transmission unit (MTU) size of 1,500 bytes.
DS925+
DS1525+
PCIe
PCIe Expansion
DS725+
DS925+
DS1525+ 1 x Gen3 x2 network upgrade slot
Appearance
Size (Height x Width x Depth)
DS725+ 166 mm × 106 mm × 223 mm
DS925+ 166 mm × 199 mm × 223 mm
DS1525+ 166 mm × 230 mm × 223 mm
Weight
DS725+ 1.51 kg
DS925+ 2.26 kg
DS1525+ 2.67 kg
Others
System Fan
DS725+ 92 mm × 92 mm × 1 pcs
DS925+ 92 mm × 92 mm × 2 pcs
DS1525+ 92 mm × 92 mm × 2 pcs
Fan Speed Mode
DS725+
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
DS925+
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
DS1525+
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Brightness Adjustable Front LED Indicators
DS725+
DS925+
DS1525+
Power Recovery
DS725+
DS925+
DS1525+
Noise Level
DS725+ 17.9 dB(A)
DS925+ 20.5 dB(A)
DS1525+ 22.60 dB(A)
Scheduled Power On / Off
DS725+
DS925+
DS1525+
Wake on LAN / WAN
DS725+
DS925+
DS1525+
Power Supply Unit / Adapter
DS725+ 65 watts
DS925+ 100 watts
120 watts*
DS1525+ 120 watts
AC Input Power Voltage
DS725+ 100V to 240V AC
DS925+ 100V to 240V AC
DS1525+ 100V to 240V AC
Power Frequency
DS725+ 50/60 Hz, Single Phase
DS925+ 50/60 Hz, Single Phase
DS1525+ 50/60 Hz, Single Phase
Power Consumption
DS725+ 20.41 watts (Access)
7.87 watts (HDD Hibernation)
DS925+ 37.91 watts (Access)
12.33 watts (HDD Hibernation)
DS1525+ 44.56 watts (Access)
13.63 watts (HDD Hibernation)
British Thermal Unit
DS725+ 69.61 BTU/hr (Access)
26.84 BTU/hr (HDD Hibernation)
DS925+ 129.27 BTU/hr (Access)
42.05 BTU/hr (HDD Hibernation)
DS1525+ 151.95 BTU/hr (Access)
46.48 BTU/hr (HDD Hibernation)
Notes
DS725+
  • For more information on how power consumption is measured, refer to this article.
  • Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two G.R.A.S. Type 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
DS925+
  • For more information on how power consumption is measured, refer to this article.
  • Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two G.R.A.S. Type 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
DS1525+
  • For more information on how power consumption is measured, refer to this article.
  • Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two G.R.A.S. Type 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
Temperature
Operating Temperature
DS725+ 0°C to 40°C (32°F to 104°F)
DS925+ 0°C to 40°C (32°F to 104°F)
DS1525+ 0°C to 40°C (32°F to 104°F)
Storage Temperature
DS725+ -20°C to 60°C (-5°F to 140°F)
DS925+ -20°C to 60°C (-5°F to 140°F)
DS1525+ -20°C to 60°C (-5°F to 140°F)
Operating Humidity
DS725+ 8% to 80% RH
DS925+ 8% to 80% RH
DS1525+ 8% to 80% RH
Storage Humidity
DS725+ 5% to 95% RH
DS925+ 5% to 95% RH
DS1525+ 5% to 95% RH
Certification
DS725+
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • CCC
  • KC
  • BIS
DS925+
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • CCC
  • KC
  • BIS
DS1525+
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • CCC
  • KC
  • BIS
Warranty
DS725+ 3-year hardware warranty, extendable to 5 years with EW201 or Extended Warranty Plus
DS925+ 3-year hardware warranty, extendable to 5 years with EW201 or Extended Warranty Plus
DS1525+ 3-year hardware warranty, extendable to 5 years with EW201 or Extended Warranty Plus
Notes
DS725+
  • The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
  • Extended Warranty Plus is only available in Europe and North America. EW201/EW202 is only available in Asia, Africa, and Oceania. For exact availability information please visit their respective websites.
DS925+
  • The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
  • Extended Warranty Plus is only available in Europe and North America. EW201/EW202 is only available in Asia, Africa, and Oceania. For exact availability information please visit their respective websites.
DS1525+
  • The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
  • Extended Warranty Plus is only available in Europe and North America. EW201/EW202 is only available in Asia, Africa, and Oceania. For exact availability information please visit their respective websites.
Environment
DS725+ RoHS Compliant
DS925+ RoHS Compliant
DS1525+ RoHS Compliant
Packaging Content
DS725+
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
DS925+
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
DS1525+
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
Optional Accessories
DS725+
DS925+
DS1525+
Notes
DS725+ For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
DS925+ For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
DS1525+ For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
Software Specs
DSM Specifications
Storage Management
Maximum Single Volume Size
DS725+
  • 200 TB (32 GB memory required)
  • 108 TB
DS925+
  • 200 TB (32 GB memory required)
  • 108 TB
DS1525+
  • 200 TB (32 GB memory required)
  • 108 TB
Maximum Internal Volume Number
DS725+ 32
DS925+ 32
DS1525+ 32
M.2 SSD Storage Pool Support*
DS725+
DS925+
DS1525+
SSD Read/Write Cache (Determining cache size)
DS725+
DS925+
DS1525+
SSD TRIM
DS725+
DS925+
DS1525+
Supported RAID Type
DS725+
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
DS925+
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
DS1525+
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RAID Migration
DS725+
  • Basic to RAID 1
  • Basic to RAID 5 (with Expansion Unit)
  • RAID 1 to RAID 5 (with Expansion Unit)
  • RAID 5 to RAID 6 (with Expansion Unit)
DS925+
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
DS1525+
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
Volume Expansion with Larger HDDs
DS725+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
DS925+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
DS1525+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Volume Expansion by Adding a HDD
DS725+
  • Synology Hybrid RAID (with Expansion Unit)
  • JBOD (with Expansion Unit)
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
DS925+
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6 (with Expansion Unit)
DS1525+
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6
Global Hot Spare Supported RAID Type
DS725+
  • Synology Hybrid RAID (with Expansion Unit)
  • RAID 1 (with Expansion Unit)
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
DS925+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
DS1525+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Notes
DS725+
  • Volumes over 108 TB require 32 GB of memory or more.
  • Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration.
  • Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored.
  • Creating M.2 storage pools requires the use of Synology-verified SSDs, which are rigorously tested under extreme temperature conditions. Thermal parameters for SSDs and NAS units are fine-tuned to ensure optimal management of thermal conditions under I/O-intensive environments. (Learn more)
DS925+
  • Volumes over 108 TB require 32 GB of memory or more.
  • Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration.
  • Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored.
  • Creating M.2 storage pools requires the use of Synology-verified SSDs, which are rigorously tested under extreme temperature conditions. Thermal parameters for SSDs and NAS units are fine-tuned to ensure optimal management of thermal conditions under I/O-intensive environments. (Learn more)
DS1525+
  • Volumes over 108 TB require 32 GB of memory or more.
  • Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration.
  • Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored.
  • Creating M.2 storage pools requires the use of Synology-verified SSDs, which are rigorously tested under extreme temperature conditions. Thermal parameters for SSDs and NAS units are fine-tuned to ensure optimal management of thermal conditions under I/O-intensive environments. (Learn more)
File System
Internal Drives
DS725+
  • Btrfs
  • ext4
DS925+
  • Btrfs
  • ext4
DS1525+
  • Btrfs
  • ext4
External Drives
DS725+
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
DS925+
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
DS1525+
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
File Services
File Protocol
DS725+
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
DS925+
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
DS1525+
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
Maximum Number of SMB Connections (FSCT-Based)
DS725+ 30
DS925+ 40
DS1525+ 40
Windows Access Control List (ACL) Integration
DS725+
DS925+
DS1525+
NFS Kerberos Authentication
DS725+
DS925+
DS1525+
Notes
DS725+
  • Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration:
    • Test workload: HomeFolder scenario provided by the FSCT tool
    • Test duration: 600 seconds
    • Domain controller & FSCT controller: Windows Server 2022
    • FSCT clients: 8 × Windows 10 machines
    • SMB feature: Directory leasing enabled
DS925+
  • Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration:
    • Test workload: HomeFolder scenario provided by the FSCT tool
    • Test duration: 600 seconds
    • Domain controller & FSCT controller: Windows Server 2022
    • FSCT clients: 8 × Windows 10 machines
    • SMB feature: Directory leasing enabled
DS1525+
  • Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration:
    • Test workload: HomeFolder scenario provided by the FSCT tool
    • Test duration: 600 seconds
    • Domain controller & FSCT controller: Windows Server 2022
    • FSCT clients: 8 × Windows 10 machines
    • SMB feature: Directory leasing enabled
Account & Shared Folder
Maximum Local User Accounts
DS725+ 512
DS925+ 512
DS1525+ 1,024
Maximum Local Groups
DS725+ 128
DS925+ 128
DS1525+ 256
Maximum Shared Folder
DS725+ 128
DS925+ 128
DS1525+ 256
Maximum Shared Folder Sync Tasks
DS725+ 4
DS925+ 4
DS1525+ 8
Hybrid Share
Maximum Hybrid Share Folders
DS725+ 10
DS925+ 10
DS1525+ 10
Hyper Backup
Folder and Package Backup
DS725+
DS925+
DS1525+
Entire System Backup
DS725+
DS925+
DS1525+
High Availability
Synology High Availability
DS725+
DS925+
DS1525+
Log Center
DS725+
DS925+
DS1525+
Syslog Events per Second
DS725+ 800
DS925+ 800
DS1525+ 800
Virtualization
VMware vSphere
DS725+ ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5
DS925+ ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5
DS1525+ ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5
Microsoft Hyper-V
DS725+ Windows Server 2022
DS925+ Windows Server 2022
DS1525+ Windows Server 2022
Citrix XenServer
DS725+ XenServer 8, Citrix Hypervisor 8.2 LTSR CU1
DS925+ XenServer 8.4, XenServer 8, Citrix Hypervisor 8.2 LTSR CU1
DS1525+ XenServer 8.4, XenServer 8, Citrix Hypervisor 8.2 LTSR CU1
OpenStack
DS725+ Cinder
DS925+ Cinder
DS1525+ Cinder
General Specifications
Supported Protocols
DS725+ SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
DS925+ SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
DS1525+ SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
DS725+
  • Chrome
  • Firefox
  • Edge
  • Safari
DS925+
  • Chrome
  • Firefox
  • Edge
  • Safari
DS1525+
  • Chrome
  • Firefox
  • Edge
  • Safari
Supported Language
DS725+ English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
DS925+ English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
DS1525+ English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
Notes
DS725+ For an updated list of supported browser versions, check the DSM Technical Specifications.
DS925+ For an updated list of supported browser versions, check the DSM Technical Specifications.
DS1525+ For an updated list of supported browser versions, check the DSM Technical Specifications.
Add-on Packages view the complete package list
Central Management System
DS725+
DS925+
DS1525+
Synology AI Console
DS725+
DS925+
DS1525+
Third-Party AI Model Integration
DS725+
DS925+
DS1525+
Maximum De-Identification Rate
DS725+ 30 words per second
DS925+ 40 words per second
DS1525+ 40 words per second
Notes
DS725+
  • De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text.
  • To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.
DS925+
  • De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text.
  • To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.
DS1525+
  • De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text.
  • To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.
Synology Chat
DS725+
DS925+
DS1525+
Maximum Number of Users
DS725+ 100
DS925+ 150
DS1525+ 150
Notes
DS725+
  • Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
  • Models with expandable memory are tested with the maximum supported quantity installed.
DS925+
  • Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
  • Models with expandable memory are tested with the maximum supported quantity installed.
DS1525+
  • Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
  • Models with expandable memory are tested with the maximum supported quantity installed.
Download Station
DS725+
DS925+
DS1525+
Maximum Concurrent Download Tasks
DS725+ 80
DS925+ 80
DS1525+ 80
SAN Manager
DS725+
DS925+
DS1525+
Maximum iSCSI Target Number
DS725+ 32
DS925+ 32
DS1525+ 64
Maximum LUN
DS725+ 64
DS925+ 64
DS1525+ 128
LUN Clone/Snapshot, Windows ODX
DS725+
DS925+
DS1525+
Synology MailPlus / MailPlus Server
DS725+
DS925+
DS1525+
Free Email Accounts
DS725+ 5 (Additional accounts require purchase of licenses)
DS925+ 5 (Additional accounts require purchase of licenses)
DS1525+ 5 (Additional accounts require purchase of licenses)
Maximum Number of Users
DS725+ 60
DS925+ 90
DS1525+ 100
Notes
DS725+
  • The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements.
  • Operating in high-availability mode will incur additional overhead.
  • Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).
DS925+
  • The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements.
  • Operating in high-availability mode will incur additional overhead.
  • Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).
DS1525+
  • The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements.
  • Operating in high-availability mode will incur additional overhead.
  • Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).
Media Server
DS725+
DS925+
DS1525+
DLNA Compliance
DS725+
DS925+
DS1525+
Synology Photos
DS725+
DS925+
DS1525+
Facial Recognition
DS725+
DS925+
DS1525+
Object Recognition
DS725+
DS925+
DS1525+
Snapshot Replication
DS725+
DS925+
DS1525+
Maximum Snapshots per Shared Folder
DS725+ 256
DS925+ 256
DS1525+ 256
Maximum Snapshots per LUN
DS725+ 32
DS925+ 32
DS1525+ 64
Maximum Snapshots per System
DS725+ 2,048
DS925+ 2,048
DS1525+ 4,096
Maximum Replication Tasks for Shared Folders
DS725+ 32
DS925+ 32
DS1525+ 32
Maximum Replication Tasks for LUNs
DS725+ 16
DS925+ 16
DS1525+ 16
Maximum Replication Tasks per System
DS725+ 32
DS925+ 32
DS1525+ 32
Surveillance Station
DS725+
DS925+
DS1525+
Default Licenses
DS725+ 2 (Additional cameras require purchase of licenses)
DS925+ 2 (Additional cameras require purchase of licenses)
DS1525+ 2 (Additional cameras require purchase of licenses)
Maximum IP Cameras and Total FPS (H.264)
DS725+
  • 1080p: 40 channels, 800 FPS
  • 3M: 35 channels, 350 FPS
  • 5M: 28 channels, 280 FPS
  • 4K: 17 channels, 170 FPS
DS925+
  • 1080p: 40 channels, 1050 FPS
  • 3M: 40 channels, 600 FPS
  • 5M: 30 channels, 360 FPS
  • 4K: 20 channels, 200 FPS
DS1525+
  • 1080p: 40 channels, 1050 FPS
  • 3M: 40 channels, 600 FPS
  • 5M: 30 channels, 360 FPS
  • 4K: 20 channels, 200 FPS
Maximum IP Cameras and Total FPS (H.265)
DS725+
  • 1080p: 40 channels, 1200 FPS
  • 3M: 40 channels, 600 FPS
  • 5M: 40 channels, 480 FPS
  • 4K: 20 channels, 200 FPS
DS925+
  • 1080p: 40 channels, 1200 FPS
  • 3M: 40 channels, 1000 FPS
  • 5M: 40 channels, 600 FPS
  • 4K: 30 channels, 300 FPS
DS1525+
  • 1080p: 40 channels, 1200 FPS
  • 3M: 40 channels, 1000 FPS
  • 5M: 40 channels, 600 FPS
  • 4K: 30 channels, 300 FPS
Notes
DS725+
  • Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads.
  • Use NVR Selector to quickly find a suitable model based on your requirements.
  • The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution.
  • The values above are based on testing with RTSP streaming. If SRTP is enabled for all cameras, overall performance will decrease to 70% of the stated figures.
DS925+
  • Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads.
  • Use NVR Selector to quickly find a suitable model based on your requirements.
  • The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution.
  • The values above are based on testing with RTSP streaming. If SRTP is enabled for all cameras, overall performance will decrease to 70% of the stated figures.
DS1525+
  • Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads.
  • Use NVR Selector to quickly find a suitable model based on your requirements.
  • The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution.
  • The values above are based on testing with RTSP streaming. If SRTP is enabled for all cameras, overall performance will decrease to 70% of the stated figures.
Synology Drive
DS725+
DS925+
DS1525+
Maximum Number of Users
DS725+ 50
DS925+ 80
DS1525+ 80
Maximum Number of Hosted Files
DS725+ 500,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
DS925+ 500,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
DS1525+ 500,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Notes
DS725+
  • The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
DS925+
  • The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
DS1525+
  • The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
Synology Office
DS725+
DS925+
DS1525+
Maximum Number of Users
DS725+ 50
DS925+ 80
DS1525+ 80
Notes
DS725+
  • The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
DS925+
  • The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
DS1525+
  • The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more
  • Models with SSD support are tested with a single SSD volume.
  • Models with expandable memory are tested with the maximum supported quantity installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
Virtual Machine Manager
DS725+
DS925+
DS1525+
Recommended Virtual Machine Instances
DS725+ 4 (Learn more)
DS925+ 8 (Learn more)
DS1525+ 8 (Learn more)
Recommended Virtual DSM Number (Licenses required)
DS725+ 4 (including 1 Free License)
DS925+ 8 (including 1 Free License)
DS1525+ 8 (including 1 Free License)
Notes
DS725+ The specifications vary depending on system configuration and memory size.
DS925+ The specifications vary depending on system configuration and memory size.
DS1525+ The specifications vary depending on system configuration and memory size.
VPN Server
DS725+
DS925+
DS1525+
Maximum Connections
DS725+ 8
DS925+ 8
DS1525+ 8