Can you proof that the card is in working conditions?
- does it work in a windows/linux pc
- if you put the tranceivers or DAC into the ports get you green lights?
We are a dell shop and use dozen of 82599 and 510 and maybe x520 (we switch later to broadcoms) but i cant remember if you can see an additional NIC within iDRAC/OMSA. For sure you will see the Cards in newer generations of Dell Poweredge. I will check this out.
Within ESXi. If the card register on the server during startup it will be visible when running "lspci" from command line. If you use | grep -i intel or x520. Example:
[root@esx-node-05:~] lspci -vv | grep -i Gigabit0000:04:00.0 Network controller Ethernet controller: Intel(R) 82599 10 Gigabit Dual Port Network Connection [vmnic4]
0000:04:00.1 Network controller Ethernet controller: Intel(R) 82599 10 Gigabit Dual Port Network Connection [vmnic5]
As long as lspci doesnt show the card the x520 isnt working in the PCI slot youre using. If you see the card.... get the PCIID and VendorID and we will find the right driver. The X520 is not a new card so iam pretty sure that the driver must already into the Dell 6.5u3 ISO Image.
Regards,
Joerg