Review on 💨 Black Synology E10G21-F2 10Gb Ethernet Adapter with 2 SFP+ Ports by Brian Olson

Summary. If you're only using this with Synology with encrypted shared folders for large file transfers, there's a limit to the higher speed benefits that 5Gbe or 10Gbe offer, but once you start using thousands of file transfers in the real world, the benefits wear off after. Our use case for Synology is a typical laptop archive storage with limited onboard storage of 2TB. We recently added a 10GbE card (Synology 10Gb Ethernet Adapter, 1 RJ45 port (E10G18-T1)) to connect our DS1817+ via USB 3.0 Type-C to 5GbE Adapter (QNA-UC5G1T) from QNAP to connect directly to non-Thunderbolt laptops. Using unencrypted shared folders on a 5 x 4TB WD Red SHR2 array or a single Samsung 850 EVO SSD, we get consistent 390MB/s up and down transfer speeds. But when transferring to encrypted shared folders, we only get around 170MB/s in writing and 350MB/s in reading from Synology. With a direct 1GBE connection, write and read speeds to and from encrypted shared folders are around 120MB/s. For exceptionally large file transfers, there is a slight benefit in the increased speed that 5GbE offers over 10GbE, but once you start using thousands of file transfers in real-world cases, the benefits really evaporate (with encrypted shared folders). find more benchmarks confirming that Synology's encrypted shared writes are capped at around 170MB/s no matter what you do to get around that bottleneck. Encryption is the real bottleneck at Synology. But you must be crazy not to turn on encryption if you care about security at all. The most likely way of losing your data is for someone to physically steal your hardware. In short, if you use encrypted shared folders, there is little real-world benefit in using 5Gbe/10Gbe on your Synology NAS.