I used whichever were cheapest to buy on ebay. WHich currently were Mellanox ConnectX-3 and HP branded Qlogic cards. Both work without a problem in my homelab.

I used whichever were cheapest to buy on ebay. WHich currently were Mellanox ConnectX-3 and HP branded Qlogic cards. Both work without a problem in my homelab. I do have one server with a built-in Intel card, that is more annoying, so I'd steer away from those in the future. The Intel card did not take all transceivers. They only wanted Cisco branded transceivers (from the ones I had available. I'm gonna guess, Intel ones would be fine too).