Comparison results

DS1520+ DS920+ DS720+
Hardware Specs
Hardware Specifications
CPU
CPU Model Intel Celeron J4125 Intel Celeron J4125 Intel Celeron J4125
CPU Quantity 1 1 1
CPU Architecture 64-bit 64-bit 64-bit
CPU Frequency 4-core 2.0 (base) / 2.7 (burst) GHz 4-core 2.0 (base) / 2.7 (burst) GHz 4-core 2.0 (base) / 2.7 (burst) GHz
Hardware Encryption Engine (AES-NI)
Memory
System Memory 8 GB DDR4 non-ECC 4 GB DDR4 non-ECC 2 GB DDR4 non-ECC
Memory Module Pre-installed 8 GB (4 GB + 4 GB)
Total Memory Slots 1 1 1
Maximum Memory Capacity 8 GB (4 GB + 4 GB) 6 GB (2 GB + 4 GB)
Notes
  • 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.
  • Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical 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.
  • Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical 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.
  • Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
Storage
Drive Bays 5 4 2
Maximum Drive Bays with Expansion Unit 15 (DX517 x 2) 9 (DX517 x 1) 7 (DX517 x 1)
M.2 Drive Slots 2 (NVMe) 2 (NVMe) 2 (NVMe)
Compatible Drive Type* (See all supported drives)
  • 3.5" SATA HDD
  • 2.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
  • 3.5" SATA HDD
  • 2.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
  • 3.5" SATA HDD
  • 2.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
Maximum Single Volume Size* 108 TB 108 TB 108 TB
Hot Swappable Drive
Notes
  • "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
  • Each internal volume (may consist of multiple drives) is expandable up to 108TB.
  • "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
  • Each internal volume (may consist of multiple drives) is expandable up to 108TB.
  • "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
  • Each internal volume (may consist of multiple drives) is expandable up to 108TB.
External Ports
RJ-45 1GbE LAN Port 4 (with Link Aggregation / Failover support) 2 (with Link Aggregation / Failover support) 2 (with Link Aggregation / Failover support)
USB 3.2 Gen 1 Port* 2 2 2
eSATA Port 2 1 1
Notes The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019. The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019. The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
File System
Internal Drives
  • Btrfs
  • EXT4
  • Btrfs
  • EXT4
  • Btrfs
  • EXT4
External Drives
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT
Appearance
Size (Height x Width x Depth) 166 mm x 230 mm x 223 mm 166 mm x 199 mm x 223 mm 166 mm x 106 mm x 223 mm
Weight 2.62 kg 2.24 kg 1.51 kg
Others
System Fan 92 mm x 92 mm x 2 pcs 92 mm x 92 mm x 2 pcs 92 mm x 92 mm x 1 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* 20.8 dB(A) 19.8 dB(A) 18.4 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 120 W 100 W 65 W
AC Input Power Voltage 100 V to 240 V AC 100 V to 240 V AC 100 V to 240 V AC
Power Frequency 50/60 Hz, Single Phase 50/60 Hz, Single Phase 50/60 Hz, Single Phase
Power Consumption* 36.67 W (Access)
15.51 W (HDD Hibernation)
32.17 W (Access)
9.69 W (HDD Hibernation)
16.44 W (Access)
6.19 W (HDD Hibernation)
British Thermal Unit 125.21 BTU/hr (Access)
52.96 BTU/hr (HDD Hibernation)
109.84 BTU/hr (Access)
33.09 BTU/hr (HDD Hibernation)
56.1 BTU/hr (Access)
21.12 BTU/hr (HDD Hibernation)
Notes
  • Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
  • Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
  • Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
  • Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
  • Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
  • Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. 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)
Relative Humidity 5% to 95% RH 5% to 95% RH 5% to 95% RH
Certification
  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • VCCI
  • RCM
  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • VCCI
  • RCM
  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • VCCI
  • RCM
Warranty 3 Years 3 Years 3 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
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
  • Quick Installation Guide X 1
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
  • Quick Installation Guide X 1
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
  • Quick Installation Guide X 1
Optional Accessories
Notes All memory modules will operate at the maximum frequency specified by the CPU manufacturer. All memory modules will operate at the maximum frequency specified by the CPU manufacturer.
Software Specs
DSM Specifications
Storage Management
Maximum Internal Volume Number 64 64 64
SSD Read / Write Cache (White Paper)
SSD TRIM
Supported RAID Type
  • 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
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
RAID Migration
  • 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
  • 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)
Volume Expansion with Larger HDDs
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
Volume Expansion by Adding a HDD
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6 (with Expansion Unit)
  • Synology Hybrid RAID
  • JBOD (with Expansion Unit)
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
Global Hot Spare Supported RAID Type
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
  • Synology Hybrid RAID
  • RAID 1 (with Expansion Unit)
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
File Services
File Protocol SMB/AFP/NFS/FTP/WebDAV SMB/AFP/NFS/FTP/WebDAV SMB/AFP/NFS/FTP/WebDAV
Maximum Concurrent SMB/AFP/FTP Connections 2,000 1,000 500
Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion) 2,000 1,500
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Notes The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
  • Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM.
  • The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
  • Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM.
  • The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
Account & Shared Folder
Maximum Local User Accounts 2,048 2,048 2,048
Maximum Local Groups 256 256 256
Maximum Shared Folder 512 512 512
Maximum Shared Folder Sync Tasks 32 16 8
High Availability
Synology High Availability
Log Center
Syslog Events per Second 800 800 800
Virtualization
VMware vSphere with VAAI
Windows Server 2016
Windows Server 2019
Citrix Ready
OpenStack
General Specifications
Networking 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
  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Safari
  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Safari
  • Google Chrome
  • Firefox
  • Microsoft 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
Antivirus by McAfee (Trial)
Central Management System
Synology Chat
Maximum Users 1,500 1,500 1,500
Notes
  • The number of concurrent HTTP connections for Synology Chat was configured to the maximum.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • The number of concurrent HTTP connections for Synology Chat was configured to the maximum.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • The number of concurrent HTTP connections for Synology Chat was configured to the maximum.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
Document Viewer
Download Station
Maximum Concurrent Download Tasks 80 80 80
SAN Manager
Maximum iSCSI Target Number 128 128 128
Maximum LUN 256 256 256
LUN Clone/Snapshot, Windows ODX
Notes iSCSI Manager has been renamed to SAN Manager in DSM 7.0. iSCSI Manager has been renamed to SAN Manager in DSM 7.0. iSCSI Manager has been renamed to SAN Manager in DSM 7.0.
Synology MailPlus / MailPlus Server
Free Email Accounts 5 (Licenses required for additional accounts) 5 (Licenses required for additional accounts) 5 (Licenses required for additional accounts)
Maximum Number of Concurrent Users 100 100 100
Maximum Server Performance 1,224,000 emails per day, approx. 37GB 1,224,000 emails per day, approx. 37GB 1,224,000 emails per day, approx. 37GB
Notes
  • Models with more than 4 bays were installed with two SSDs for SSD cache.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
  • Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).
  • Models with more than 4 bays were installed with two SSDs for SSD cache.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
  • Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).
  • Models with 2 bays and dual M.2 drive slots were installed with two SSDs for SSD cache.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
  • Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).
Media Server
DLNA Compliance
Synology Photos
Facial Recognition
Notes Photo Station and Synology Moments are succeeded by Synology Photos in DSM 7.0. For a features comparison, check this article. Photo Station and Synology Moments are succeeded by Synology Photos in DSM 7.0. For a features comparison, check this article. Photo Station and Synology Moments are succeeded by Synology Photos in DSM 7.0. For a features comparison, check this article.
Snapshot Replication
Maximum Snapshots per Shared Folder 1,024 1,024 1,024
Maximum of System Snapshots 65,536 65,536 65,536
Surveillance Station
Maximum IP cam (Licenses required) 40 (including 2 Free License) (See All Supported IP Cameras) 40 (including 2 Free License) (See All Supported IP Cameras) 40 (including 2 Free License) (See All Supported IP Cameras)
Total FPS (H.264) 1200 FPS @ 720p (1280x720)
1050 FPS @ 1080p (1920x1080)
600 FPS @ 3M (2048x1536)
360 FPS @ 5M (2591x1944)
200 FPS @ 4K (3840x2160)
1200 FPS @ 720p (1280x720)
1050 FPS @ 1080p (1920x1080)
600 FPS @ 3M (2048x1536)
360 FPS @ 5M (2591x1944)
200 FPS @ 4K (3840x2160)
1200 FPS @ 720p (1280x720)
800 FPS @ 1080p (1920x1080)
350 FPS @ 3M (2048x1536)
280 FPS @ 5M (2591x1944)
170 FPS @ 4K (3840x2160)
Total FPS (H.265) 1200 FPS @ 720p (1280x720)
1200 FPS @ 1080p (1920x1080)
1000 FPS @ 3M (2048x1536)
600 FPS @ 5M (2591x1944)
300 FPS @ 4K (3840x2160)
1200 FPS @ 720p (1280x720)
1200 FPS @ 1080p (1920x1080)
1000 FPS @ 3M (2048x1536)
600 FPS @ 5M (2591x1944)
300 FPS @ 4K (3840x2160)
1200 FPS @ 720p (1280x720)
1200 FPS @ 1080p (1920x1080)
600 FPS @ 3M (2048x1536)
480 FPS @ 5M (2591x1944)
200 FPS @ 4K (3840x2160)
Total FPS (MJPEG) 680 FPS @ 720p (1280x720)
400 FPS @ 1080p (1920x1080)
300 FPS @ 3M (2048x1536)
200 FPS @ 5M (2591x1944)
680 FPS @ 720p (1280x720)
400 FPS @ 1080p (1920x1080)
300 FPS @ 3M (2048x1536)
200 FPS @ 5M (2591x1944)
450 FPS @ 720p (1280x720)
250 FPS @ 1080p (1920x1080)
200 FPS @ 3M (2048x1536)
100 FPS @ 5M (2591x1944)
Notes
  • Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera.
  • The maximum channel number also includes devices installed on Virtual DSM.
  • Total FPS may be affected by other services running at the same time (e.g., archive tasks performed by Archive Vault).
  • Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera.
  • The maximum channel number also includes devices installed on Virtual DSM.
  • Total FPS may be affected by other services running at the same time (e.g., archive tasks performed by Archive Vault).
  • Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera.
  • The maximum channel number also includes devices installed on Virtual DSM.
  • Total FPS may be affected by other services running at the same time (e.g., archive tasks performed by Archive Vault).
Synology Drive
Recommended Number of Hosted Files 5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) 5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) 5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Recommended Number of Concurrent Sync Clients 350 (the number of connections that can be maintained when the recommended number of hosted files was reached) 350 (the number of connections that can be maintained when the recommended number of hosted files was reached) 350 (the number of connections that can be maintained when the recommended number of hosted files was reached)
Notes
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Utilizing SSD cache can significantly improve performance.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Utilizing SSD cache can significantly improve performance.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Utilizing SSD cache can significantly improve performance.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
Synology Office
Maximum Users 1,200 1,200 1,200
Notes
  • Multiple files were opened for testing and each file was edited by 30 users simultaneously.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
  • Multiple files were opened for testing and each file was edited by 30 users simultaneously.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
  • Multiple files were opened for testing and each file was edited by 30 users simultaneously.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
Video Station
Virtual Machine Manager
Recommended Virtual Machine Instances 4 (Learn more) 4 (Learn more) 2 (Learn more)
Recommended Virtual DSM Number (Licenses required) 4 (including 1 Free License) 4 (including 1 Free License) 2 (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 30 30 30
Hardware Specs
Hardware Specifications
CPU
CPU Model
DS1520+ Intel Celeron J4125
DS920+ Intel Celeron J4125
DS720+ Intel Celeron J4125
CPU Quantity
DS1520+ 1
DS920+ 1
DS720+ 1
CPU Architecture
DS1520+ 64-bit
DS920+ 64-bit
DS720+ 64-bit
CPU Frequency
DS1520+ 4-core 2.0 (base) / 2.7 (burst) GHz
DS920+ 4-core 2.0 (base) / 2.7 (burst) GHz
DS720+ 4-core 2.0 (base) / 2.7 (burst) GHz
Hardware Encryption Engine (AES-NI)
DS1520+
DS920+
DS720+
Memory
System Memory
DS1520+ 8 GB DDR4 non-ECC
DS920+ 4 GB DDR4 non-ECC
DS720+ 2 GB DDR4 non-ECC
Memory Module Pre-installed
DS1520+ 8 GB (4 GB + 4 GB)
DS920+
DS720+
Total Memory Slots
DS1520+ 1
DS920+ 1
DS720+ 1
Maximum Memory Capacity
DS1520+
DS920+ 8 GB (4 GB + 4 GB)
DS720+ 6 GB (2 GB + 4 GB)
Notes
DS1520+
  • 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.
  • Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
DS920+
  • 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.
  • Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
DS720+
  • 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.
  • Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
Storage
Drive Bays
DS1520+ 5
DS920+ 4
DS720+ 2
Maximum Drive Bays with Expansion Unit
DS1520+ 15 (DX517 x 2)
DS920+ 9 (DX517 x 1)
DS720+ 7 (DX517 x 1)
M.2 Drive Slots
DS1520+ 2 (NVMe)
DS920+ 2 (NVMe)
DS720+ 2 (NVMe)
Compatible Drive Type* (See all supported drives)
DS1520+
  • 3.5" SATA HDD
  • 2.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
DS920+
  • 3.5" SATA HDD
  • 2.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
DS720+
  • 3.5" SATA HDD
  • 2.5" SATA HDD
  • 2.5" SATA SSD
  • M.2 2280 NVMe SSD
Maximum Single Volume Size*
DS1520+ 108 TB
DS920+ 108 TB
DS720+ 108 TB
Hot Swappable Drive
DS1520+
DS920+
DS720+
Notes
DS1520+
  • "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
  • Each internal volume (may consist of multiple drives) is expandable up to 108TB.
DS920+
  • "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
  • Each internal volume (may consist of multiple drives) is expandable up to 108TB.
DS720+
  • "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
  • Each internal volume (may consist of multiple drives) is expandable up to 108TB.
External Ports
RJ-45 1GbE LAN Port
DS1520+ 4 (with Link Aggregation / Failover support)
DS920+ 2 (with Link Aggregation / Failover support)
DS720+ 2 (with Link Aggregation / Failover support)
USB 3.2 Gen 1 Port*
DS1520+ 2
DS920+ 2
DS720+ 2
eSATA Port
DS1520+ 2
DS920+ 1
DS720+ 1
Notes
DS1520+ The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
DS920+ The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
DS720+ The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
File System
Internal Drives
DS1520+
  • Btrfs
  • EXT4
DS920+
  • Btrfs
  • EXT4
DS720+
  • Btrfs
  • EXT4
External Drives
DS1520+
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT
DS920+
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT
DS720+
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT
Appearance
Size (Height x Width x Depth)
DS1520+ 166 mm x 230 mm x 223 mm
DS920+ 166 mm x 199 mm x 223 mm
DS720+ 166 mm x 106 mm x 223 mm
Weight
DS1520+ 2.62 kg
DS920+ 2.24 kg
DS720+ 1.51 kg
Others
System Fan
DS1520+ 92 mm x 92 mm x 2 pcs
DS920+ 92 mm x 92 mm x 2 pcs
DS720+ 92 mm x 92 mm x 1 pcs
Fan Speed Mode
DS1520+
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
DS920+
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
DS720+
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Brightness Adjustable Front LED Indicators
DS1520+
DS920+
DS720+
Power Recovery
DS1520+
DS920+
DS720+
Noise Level*
DS1520+ 20.8 dB(A)
DS920+ 19.8 dB(A)
DS720+ 18.4 dB(A)
Scheduled Power On / Off
DS1520+
DS920+
DS720+
Wake on LAN / WAN
DS1520+
DS920+
DS720+
Power Supply Unit / Adapter
DS1520+ 120 W
DS920+ 100 W
DS720+ 65 W
AC Input Power Voltage
DS1520+ 100 V to 240 V AC
DS920+ 100 V to 240 V AC
DS720+ 100 V to 240 V AC
Power Frequency
DS1520+ 50/60 Hz, Single Phase
DS920+ 50/60 Hz, Single Phase
DS720+ 50/60 Hz, Single Phase
Power Consumption*
DS1520+ 36.67 W (Access)
15.51 W (HDD Hibernation)
DS920+ 32.17 W (Access)
9.69 W (HDD Hibernation)
DS720+ 16.44 W (Access)
6.19 W (HDD Hibernation)
British Thermal Unit
DS1520+ 125.21 BTU/hr (Access)
52.96 BTU/hr (HDD Hibernation)
DS920+ 109.84 BTU/hr (Access)
33.09 BTU/hr (HDD Hibernation)
DS720+ 56.1 BTU/hr (Access)
21.12 BTU/hr (HDD Hibernation)
Notes
DS1520+
  • Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
  • Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
DS920+
  • Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
  • Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
DS720+
  • Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
  • Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
Temperature
Operating Temperature
DS1520+ 0°C to 40°C (32°F to 104°F)
DS920+ 0°C to 40°C (32°F to 104°F)
DS720+ 0°C to 40°C (32°F to 104°F)
Storage Temperature
DS1520+ -20°C to 60°C (-5°F to 140°F)
DS920+ -20°C to 60°C (-5°F to 140°F)
DS720+ -20°C to 60°C (-5°F to 140°F)
Relative Humidity
DS1520+ 5% to 95% RH
DS920+ 5% to 95% RH
DS720+ 5% to 95% RH
Certification
DS1520+
  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • VCCI
  • RCM
DS920+
  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • VCCI
  • RCM
DS720+
  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • VCCI
  • RCM
Warranty
DS1520+ 3 Years
DS920+ 3 Years
DS720+ 3 Years
Notes
DS1520+ The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
DS920+ The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
DS720+ The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment
DS1520+ RoHS Compliant
DS920+ RoHS Compliant
DS720+ RoHS Compliant
Packaging Content
DS1520+
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
  • Quick Installation Guide X 1
DS920+
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
  • Quick Installation Guide X 1
DS720+
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
  • Quick Installation Guide X 1
Optional Accessories
DS1520+
DS920+
DS720+
Notes
DS1520+
DS920+ All memory modules will operate at the maximum frequency specified by the CPU manufacturer.
DS720+ All memory modules will operate at the maximum frequency specified by the CPU manufacturer.
Software Specs
DSM Specifications
Maximum Internal Volume Number
DS1520+ 64
DS920+ 64
DS720+ 64
SSD Read / Write Cache (White Paper)
DS1520+
DS920+
DS720+
SSD TRIM
DS1520+
DS920+
DS720+
Supported RAID Type
DS1520+
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
DS920+
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
DS720+
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
RAID Migration
DS1520+
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
DS920+
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
DS720+
  • 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)
Volume Expansion with Larger HDDs
DS1520+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
DS920+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
DS720+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
Volume Expansion by Adding a HDD
DS1520+
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6
DS920+
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6 (with Expansion Unit)
DS720+
  • Synology Hybrid RAID
  • JBOD (with Expansion Unit)
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
Global Hot Spare Supported RAID Type
DS1520+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
DS920+
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
DS720+
  • Synology Hybrid RAID
  • RAID 1 (with Expansion Unit)
  • RAID 5 (with Expansion Unit)
  • RAID 6 (with Expansion Unit)
  • RAID 10 (with Expansion Unit)
File Protocol
DS1520+ SMB/AFP/NFS/FTP/WebDAV
DS920+ SMB/AFP/NFS/FTP/WebDAV
DS720+ SMB/AFP/NFS/FTP/WebDAV
Maximum Concurrent SMB/AFP/FTP Connections
DS1520+ 2,000
DS920+ 1,000
DS720+ 500
Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion)
DS1520+
DS920+ 2,000
DS720+ 1,500
Windows Access Control List (ACL) Integration
DS1520+
DS920+
DS720+
NFS Kerberos Authentication
DS1520+
DS920+
DS720+
Notes
DS1520+ The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
DS920+
  • Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM.
  • The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
DS720+
  • Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM.
  • The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
Maximum Local User Accounts
DS1520+ 2,048
DS920+ 2,048
DS720+ 2,048
Maximum Local Groups
DS1520+ 256
DS920+ 256
DS720+ 256
Maximum Shared Folder
DS1520+ 512
DS920+ 512
DS720+ 512
Maximum Shared Folder Sync Tasks
DS1520+ 32
DS920+ 16
DS720+ 8
Synology High Availability
DS1520+
DS920+
DS720+
DS1520+
DS920+
DS720+
Syslog Events per Second
DS1520+ 800
DS920+ 800
DS720+ 800
Virtualization
VMware vSphere with VAAI
DS1520+
DS920+
DS720+
Windows Server 2016
DS1520+
DS920+
DS720+
Windows Server 2019
DS1520+
DS920+
DS720+
Citrix Ready
DS1520+
DS920+
DS720+
OpenStack
DS1520+
DS920+
DS720+
Networking Protocols
DS1520+ SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
DS920+ SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
DS720+ SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
DS1520+
  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Safari
DS920+
  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Safari
DS720+
  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Safari
Supported Language
DS1520+ 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
DS920+ 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
DS720+ 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
DS1520+ For an updated list of supported browser versions, check the DSM Technical Specifications.
DS920+ For an updated list of supported browser versions, check the DSM Technical Specifications.
DS720+ For an updated list of supported browser versions, check the DSM Technical Specifications.
Antivirus by McAfee (Trial)
DS1520+
DS920+
DS720+
DS1520+
DS920+
DS720+
DS1520+
DS920+
DS720+
Maximum Users
DS1520+ 1,500
DS920+ 1,500
DS720+ 1,500
Notes
DS1520+
  • The number of concurrent HTTP connections for Synology Chat was configured to the maximum.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
DS920+
  • The number of concurrent HTTP connections for Synology Chat was configured to the maximum.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
DS720+
  • The number of concurrent HTTP connections for Synology Chat was configured to the maximum.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
Document Viewer
DS1520+
DS920+
DS720+
Download Station
DS1520+
DS920+
DS720+
Maximum Concurrent Download Tasks
DS1520+ 80
DS920+ 80
DS720+ 80
DS1520+
DS920+
DS720+
Maximum iSCSI Target Number
DS1520+ 128
DS920+ 128
DS720+ 128
Maximum LUN
DS1520+ 256
DS920+ 256
DS720+ 256
LUN Clone/Snapshot, Windows ODX
DS1520+
DS920+
DS720+
Notes
DS1520+ iSCSI Manager has been renamed to SAN Manager in DSM 7.0.
DS920+ iSCSI Manager has been renamed to SAN Manager in DSM 7.0.
DS720+ iSCSI Manager has been renamed to SAN Manager in DSM 7.0.
DS1520+
DS920+
DS720+
Free Email Accounts
Maximum Number of Concurrent Users
DS1520+ 100
DS920+ 100
DS720+ 100
Maximum Server Performance
DS1520+ 1,224,000 emails per day, approx. 37GB
DS920+ 1,224,000 emails per day, approx. 37GB
DS720+ 1,224,000 emails per day, approx. 37GB
Notes
DS1520+
  • Models with more than 4 bays were installed with two SSDs for SSD cache.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
  • Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).
DS920+
  • Models with more than 4 bays were installed with two SSDs for SSD cache.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
  • Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).
DS720+
  • Models with 2 bays and dual M.2 drive slots were installed with two SSDs for SSD cache.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
  • Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).
DS1520+
DS920+
DS720+
DLNA Compliance
DS1520+
DS920+
DS720+
DS1520+
DS920+
DS720+
Facial Recognition
DS1520+
DS920+
DS720+
Notes
DS1520+ Photo Station and Synology Moments are succeeded by Synology Photos in DSM 7.0. For a features comparison, check this article.
DS920+ Photo Station and Synology Moments are succeeded by Synology Photos in DSM 7.0. For a features comparison, check this article.
DS720+ Photo Station and Synology Moments are succeeded by Synology Photos in DSM 7.0. For a features comparison, check this article.
DS1520+
DS920+
DS720+
Maximum Snapshots per Shared Folder
DS1520+ 1,024
DS920+ 1,024
DS720+ 1,024
Maximum of System Snapshots
DS1520+ 65,536
DS920+ 65,536
DS720+ 65,536
DS1520+
DS920+
DS720+
Maximum IP cam (Licenses required)
DS1520+ 40 (including 2 Free License) (See All Supported IP Cameras)
DS920+ 40 (including 2 Free License) (See All Supported IP Cameras)
DS720+ 40 (including 2 Free License) (See All Supported IP Cameras)
Total FPS (H.264)
DS1520+ 1200 FPS @ 720p (1280x720)
1050 FPS @ 1080p (1920x1080)
600 FPS @ 3M (2048x1536)
360 FPS @ 5M (2591x1944)
200 FPS @ 4K (3840x2160)
DS920+ 1200 FPS @ 720p (1280x720)
1050 FPS @ 1080p (1920x1080)
600 FPS @ 3M (2048x1536)
360 FPS @ 5M (2591x1944)
200 FPS @ 4K (3840x2160)
DS720+ 1200 FPS @ 720p (1280x720)
800 FPS @ 1080p (1920x1080)
350 FPS @ 3M (2048x1536)
280 FPS @ 5M (2591x1944)
170 FPS @ 4K (3840x2160)
Total FPS (H.265)
DS1520+ 1200 FPS @ 720p (1280x720)
1200 FPS @ 1080p (1920x1080)
1000 FPS @ 3M (2048x1536)
600 FPS @ 5M (2591x1944)
300 FPS @ 4K (3840x2160)
DS920+ 1200 FPS @ 720p (1280x720)
1200 FPS @ 1080p (1920x1080)
1000 FPS @ 3M (2048x1536)
600 FPS @ 5M (2591x1944)
300 FPS @ 4K (3840x2160)
DS720+ 1200 FPS @ 720p (1280x720)
1200 FPS @ 1080p (1920x1080)
600 FPS @ 3M (2048x1536)
480 FPS @ 5M (2591x1944)
200 FPS @ 4K (3840x2160)
Total FPS (MJPEG)
DS1520+ 680 FPS @ 720p (1280x720)
400 FPS @ 1080p (1920x1080)
300 FPS @ 3M (2048x1536)
200 FPS @ 5M (2591x1944)
DS920+ 680 FPS @ 720p (1280x720)
400 FPS @ 1080p (1920x1080)
300 FPS @ 3M (2048x1536)
200 FPS @ 5M (2591x1944)
DS720+ 450 FPS @ 720p (1280x720)
250 FPS @ 1080p (1920x1080)
200 FPS @ 3M (2048x1536)
100 FPS @ 5M (2591x1944)
Notes
DS1520+
  • Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera.
  • The maximum channel number also includes devices installed on Virtual DSM.
  • Total FPS may be affected by other services running at the same time (e.g., archive tasks performed by Archive Vault).
DS920+
  • Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera.
  • The maximum channel number also includes devices installed on Virtual DSM.
  • Total FPS may be affected by other services running at the same time (e.g., archive tasks performed by Archive Vault).
DS720+
  • Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera.
  • The maximum channel number also includes devices installed on Virtual DSM.
  • Total FPS may be affected by other services running at the same time (e.g., archive tasks performed by Archive Vault).
DS1520+
DS920+
DS720+
Recommended Number of Hosted Files
DS1520+ 5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
DS920+ 5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
DS720+ 5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Recommended Number of Concurrent Sync Clients
DS1520+ 350 (the number of connections that can be maintained when the recommended number of hosted files was reached)
DS920+ 350 (the number of connections that can be maintained when the recommended number of hosted files was reached)
DS720+ 350 (the number of connections that can be maintained when the recommended number of hosted files was reached)
Notes
DS1520+
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Utilizing SSD cache can significantly improve performance.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
DS920+
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Utilizing SSD cache can significantly improve performance.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
DS720+
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Utilizing SSD cache can significantly improve performance.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
DS1520+
DS920+
DS720+
Maximum Users
DS1520+ 1,200
DS920+ 1,200
DS720+ 1,200
Notes
DS1520+
  • Multiple files were opened for testing and each file was edited by 30 users simultaneously.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
DS920+
  • Multiple files were opened for testing and each file was edited by 30 users simultaneously.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
DS720+
  • Multiple files were opened for testing and each file was edited by 30 users simultaneously.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
DS1520+
DS920+
DS720+
DS1520+
DS920+
DS720+
Recommended Virtual Machine Instances
DS1520+ 4 (Learn more)
DS920+ 4 (Learn more)
DS720+ 2 (Learn more)
Recommended Virtual DSM Number (Licenses required)
DS1520+ 4 (including 1 Free License)
DS920+ 4 (including 1 Free License)
DS720+ 2 (including 1 Free License)
Notes
DS1520+ The specifications vary depending on system configuration and memory size.
DS920+ The specifications vary depending on system configuration and memory size.
DS720+ The specifications vary depending on system configuration and memory size.
DS1520+
DS920+
DS720+
Maximum Connections
DS1520+ 30
DS920+ 30
DS720+ 30