10Gtek 25G SFP28 SFP+ Transceiver, 25GBase-SR Module, 850nm MMF, up to 100meters, Compatible with Mellanox MMA2P00-AS

Works without any fuss with my QNAP 25Gb switches / NICs (I believe these are rebranded Mellanox units, or at least using Mellanox chips). I have been purchasing 10Gtek optics and DACS for some time, in 1G/10G and 25G variants and they have always been excellent. I would recommend them to anyone.

Beware before purchase! Initially I ordered 2 and they seem to work fine until I start to notice performance issues. It took me some time to trace the issue down to an incompatibility between these transceivers and Ubiquiti switches. I ordered 4 more which all show the same major performance issues (down to ~ 30 Mbps under some circumstances. I have tried several other brands including Ubiquiti transceivers and they all work fine. None of these 10GTek work without a problem. I mailed support via their website, They boast good technical support but I never got a reply. I can return 4, but the first order I can no longer return and there is no support. Think twice! Pay a little more.

Fait tres bien le boulot, faut juste faire attention, il n'est pas multi vitesse: certains modules sont compatibles 10Gb et 25Gb, celui la est uniquement compatible 25Gb.

Leider funktionieren diese SFP28 Module nicht wenn in 2 Ubiquiti Switchen die 10Gtek Module verbaut sind. 1x Original Ubiquiti SFP28 Modul und 1x 10Gtek funktionieren hingegen. In diversen Ubiquiti Switchen getestet immer mit gleichem Ergebniss.

I bought both Mellanox and Intel versions and they seem to be interchangeable. Both work with 25gbe NICs from both brands. Both work with QNAP switches. Neither can work with a NETGEAR sfp+ switch in 10Gbe mode, even though I had another 10G copper adapter from 10GTek that worked with SFP28 NICs.