Tue May 22, 2012 6:30 am
I'm not sure. I would think that even if the Dell BIOS incorrectly detected the card, this would not necessarily prevent ESXi or any other OS from being able to use it...many OSes don't rely on/trust the information that the BIOS feeds them and probe all the hardware again themselves.
Perhaps the problem has more to do with the PCI bridge chip on the card? If memory serves me correctly, these cards essentially have 4 separate PCI ethernet MAC chips on them, and a PCI bridge that allows it to "multiplex" all 4 PCI devices on one PCI slot/card. Perhaps there is an incompatibility between that chip and the 2950 motherboard somehow? Just a guess...
-- Nathan