Synology E25G21-F2 Dual 25G SFP+ Port PCIe 3.0 Adapter
Product Overview
The Synology E25G21-F2 is a dual-port 25 GbE SFP28 network adapter that installs in a PCIe 3.0 x8 slot to deliver high-bandwidth connectivity for heavy-duty storage and IP-SAN deployments. It’s built and tested by Synology to maximize performance and reliability in compatible NAS and SAN systems.
Key Features
- Dual 25 GbE SFP28 ports with auto-negotiation between 25 Gb/s and 10 Gb/s speeds
- Support for optical SR, optical LR transceivers and DAC modules to optimize distance and total cost of ownership
- CPU offloading technologies—TCP/UDP checksum offload, Large Send Offload (LSO), TCP Segmentation Offload (TSO), Generic Receive Offload (GRO), Generic Segmentation Offload (GSO), Receive Side Scaling (RSS), Transmit Side Scaling (TSS)—to minimize host CPU load
- IEEE 802.3ad Link Aggregation for up to 50 Gb/s aggregate throughput, port-level failover and load balancing
- Backwards compatibility with 10 GbE SFP+ equipment for seamless infrastructure upgrades
- Designed and validated by Synology for maximum system compatibility and endurance
- Five-year limited hardware warranty for extended protection
Technical Specifications
| Specification | Details |
|---|---|
| Host Bus Interface | PCIe 3.0 x8 |
| Bracket Options | Full-height and low-profile |
| Dimensions (H × W × D) | 69 × 168 × 17.3 mm |
| Operating Temperature | 0 °C to 40 °C |
| Storage Temperature | –20 °C to 60 °C |
| Relative Humidity | 5 % to 95 % RH (non-condensing) |
| Warranty | Five years limited |
| Network Standards | IEEE 802.3ae (10 GbE), IEEE 802.3by (25 GbE), IEEE 802.3ad (LAG) |
| Ports | 2 × SFP28 |
| Data Transfer Rates | 25 Gbps/10 Gbps |
| Jumbo Frame Support | 1.5 KB to 9 KB |
| Supported Offloads | TCP/UDP checksum, LSO, TSO, GRO, GSO, RSS, TSS |
Specifications subject to change; refer to Synology’s official datasheet for the latest details.
Performance & Reliability
By leveraging dual 25 GbE lanes and full hardware offloads, the E25G21-F2 sustains line-rate transfers per port while offloading packet processing from the host CPU. This ensures deterministic, low-latency performance for bandwidth-intensive tasks such as high-resolution media editing, large-scale backups, and IP-SAN storage services.
Compatibility
Fully validated for seamless integration with select Synology RackStation, DiskStation, and IP-SAN platforms. Its backwards compatibility with 10 GbE SFP+ infrastructure allows you to upgrade to 25 GbE speeds without replacing existing cabling or switches.
Use Cases
- High-performance storage networks and IP-SAN deployments
- Media production: high-resolution video editing and rendering
- Large-scale, low-latency backup and restore operations
- Virtualization and multi-tenant database applications requiring high throughput
- Incremental network speed upgrades leveraging existing 10 GbE SFP+ hardware
Warranty & Support
Synology provides a five-year limited hardware warranty, starting from the purchase date shown on your receipt. Global support—including LiveChat and authorized service partners—is available to ensure maximum uptime and ROI.
References
- Synology E25G21-F2 Data Sheet, Synology Inc. (Global Download Center)
Reviews
There are no reviews yet.