E25G21-F2

Dual-port SFP28 add-in card designed to accelerate bandwidth-intensive workflows

Features
Specs

Maximize Bandwidth for Heavy-Duty Applications

The Synology E25G21-F2 is a dual-port 25GbE SFP28 network interface card that lets you boost network bandwidth and performance. Handle higher quantities of data traffic for increased users and the most data-intensive workloads.

Throughput

Dual-port 25GbE SFP28

Flexibility

Optical SR, Optical LR, and DAC support

Compatibility

Purpose-built for Synology servers

Boost throughput within minutes

Easy installation
Link Aggregation

Upgrade Synology systems with faster networking speeds. Thorough validation ensures seamless integration with DSM.
Check compatibility
Combine the E25G21-F2’s two 25GbE ports into a Link Aggregation group to enable higher simultaneous throughput, port failover, and load balancing.

Easy installation

Upgrade Synology systems with faster networking speeds. Thorough validation ensures seamless integration with DSM.

Check compatibility

Link Aggregation

Combine the E25G21-F2’s two 25GbE ports into a Link Aggregation group to enable higher simultaneous throughput, port failover, and load balancing.

5-year warranty

At Synology, we are committed to product innovation and quality. Synology guarantees a robust and reliable data management experience with a 5-year limited warranty, providing responsive technical support and hardware replacement services to maximize your return on investment.

High performance storage systems

DiskStation

FS6400

240,000 4K random write IOPS
Dual 8-core 2.1 GHz CPU
Synology RAID F1 for flash storage endurance

Learn more

DiskStation

SA3600

12-core CPU Turbo Boost up to 2.7 GHz
Over 5,500 MB/s sequential throughput reading
Scale up to 180/96 drives

Learn more

DiskStation

RS4021xs+

Over 234,698 4K random read IOPS
Built-in dual 10GbE ports
Up to 40 bays with RX1217(RP)

Learn more

Hardware Specifications
General
General	Host Bus Interface	PCIe 3.0 x8
	Bracket Height	Low Profile and Full Height
	Size (Height x Width x Depth)	69 mm x 168 mm x 17.3 mm
	Operating Temperature	0°C to 40°C (32°F to 104°F)
	Storage Temperature	-20°C to 60°C (-5°F to 140°F)
	Relative Humidity	5% to 95% RH
	Warranty	5 Years
	Notes	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Network
Network	IEEE Specification Compliance	IEEE 802.3ad Link Aggregation IEEE 802.3ae 10Gbps Ethernet IEEE 802.3by 25Gbps Ethernet
	Data Transfer Rates	25 Gbps
	Supported Features	TCP Segmentation Offload (TSO) Large Send Offload (LSO) Receive Side Scaling (RSS) Generic Receive Offload (GRO) Generic Segmentation Offload (GSO) 1.5 - 9 KB Jumbo Frame Offloaded storage over Ethernet Non-offloaded storage over Ethernet Auto-negotiation between 10Gb/s and 25Gb/s TCP/UDP Checksum Offload Transmit side scaling (TSS)
Compatibility
Applied Models
Applied Models	FS series:FS6400, FS3600, FS3400, FS3017, FS2017, FS1018 SA series:SA3600, SA3400, SA3200D UC series:UC3200 21 series:RS4021xs+, RS3621xs+, RS3621RPxs, RS2821RP+, RS2421RP+, RS2421+, RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+ 19 series:RS1619xs+ 18 series:RS3618xs, DS3018xs 17 series:RS18017xs+, RS4017xs+, RS3617xs+, RS3617RPxs, DS3617xs, DS3617xsII
	Notes	DSM version requirement: 6.2.3-25426 or later version

Notes:

Model specifications are subject to change without prior notice.
The figures are based on Synology internal testing. Each performance test is done individually. No other services or applications are processed at the same time.
The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations.
If usage requirements exceed the specifications above, please contact our regional partners for professional advice.