The difference between revision B and revision C MCX312C-XCCT Connectx-3 Pro EN.

I want to buy these network cards, but I can not decide on the choice of revision, because I do not understand what is the difference?

I needed to configure S2D between two adapters MCX312C-XCCT Connectx-3 Pro EN on servers. Will Microsoft support this technology with these adapters?

The Revision C adapter is a card with high-frequency ConnectX-3 Pro (running at 427MHz), as opposed to the Revision B which runs at lower speed.

With this high freq (RevC) , we get better performance, mainly message rate.

Keep in mind that RevC card is larger and consume more power compared to RevB.