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Boost your data throughput to support bandwidth-heavy workflows such as high-resolution videos with the E25G21-F2 Dual 25G Ethernet SFP+ Port PCIe 3.0 Adapter from Synology. Designed specially for select Synology NAS systems, this network adapter installs into an available PCIe 3.0 x8 slot, adding two 25 Gigabit Ethernet ports. These ports also support optical SR, optical LR, and DAC transceiver modules to optimize connectivity. You can also combine both ports using link aggregation for higher simultaneous throughput, port failover, and load balancing. Additionally, built-in CPU offloading technologies help to reduce the host system’s network transfer overhead to further enhance performance. Both low and full height brackets are included.
| Weight | 0.45 lbs |
|---|---|
| Dimensions | 8.5 × 4.8 × 1.7 in |
| Networking Ports | 2 x 25Gb Ethernet (RJ45) |
| Transceiver Slots | 2 x Enhanced Small Form-factor Pluggable (SFP+) |
| Host Connection | PCIe 3.0 x8 (Full-Height/Low-Profile Slot) |
| Supported IEEE Standards | 802.3ad, 802.3ae, 802.3by |
| Transfer Rates | Full-Duplex Mode: 25 Gb/s |
| Power Source | Bus Powered |
| Operating Temperature | 32 to 104°F / 0 to 40°C |
| Storage Temperature | -4 to 140°F / -20 to 60°C |
| Operating Humidity | 5 to 95% |
1 review for Synology E25G21-F2 Dual 25G Ethernet SFP+ Port PCIe 3.0 Adapter
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Delta Fay (verified owner) –
This SFP28 E25G21-F2 25Gbps card is finicky about which cable it gets plugged into the ports to work at 25Gbps. You must purchase one of the cables from the Synology compatibility list. If the cables are not from the compatibility list, it will only work at 10Gbps. We used the OEM Mellanox DAC cables which worked flawlessly. Amazon.com so-called Mellanox SFP28 compatible cables don’t work at 25Gbps (we tried 4 different sets). A switch with SFP28 25Gbps ports will be required to operate at 25Gbps. Your Workstations will also need SFP28 25Gbps network cards plugged into pcie 3.0 or 4.0 ports x8 to benefit from the 25Gbps network speed now available to your Workstations. Your NAS will need the fastest NVME drives installed in the cache slots in order to saturate the network bandwidth. One clause tho, pcie 3.0 NVME cache drives don’t fully saturate the 25Gbps network. The Samsung 980 pro gen 4 drives do better than the gen 3 drives by a slight amount read, but notably better with write speeds. Even the gen 4 drives don’t fully saturate the 25Gbps network installed in the Synology NAS pcie 3.0 cache slots. Only if Synology would have installed pcie 4.0 nvme cache ports into the current NAS systems. Also trunk porting the NAS does nothing for speed, just redundancy. Must be a Synology thing? Our file access speed has more than double from our old 10Gbps network (18Gbps), now that all these hiccups have been ironed out of the Synology card. The changeover to this Synology 25Gbps network could have been easier with more technical literature from Synology. We have operated some of these Synology devices for several years now. All devices work great in constant use environments. With easy to use software. We purchased all our Synology NAS devices, cards and drives from B&H. They were very accommodating with all aspects of this purchase. Hope this lesson of trial and error helps others purchasing this card to upgrade their NAS.