Ditto. A few times I've had issues where I had compatibility issues until I upgraded the firmware on the card. For a long time I used infiniband between fast

Ditto. A few times I've had issues where I had compatibility issues until I upgraded the firmware on the card. For a long time I used infiniband between fast systems just because the cards were available so cheaply, but now 40gbe is really cheap (and 100gbe is getting there). I'm really not that fond of 10G-T, it's picky about cables and power hungry. Give me fiber or a dac cable any day.