Please let the "Layer 1 Magician" reply, it might be some secret knowledge incorporated (might be flashed, connects at 100G, but just max out at 7.877 GB/s) :)
If seriously: 12 cards already sold within last 24 hours
Thank you for the details.
The biggest problem was that I never "got it to work" (except under Ubuntu installed for test separately).
Win7 x64 here, no BSODs, but the 5152 NICs have constantly been refusing any driver I tried to feed to it.
Summary: all that mess was not really worth it.
7120 is absolutely different story - I got one at same time as 5152.
The dual port one worked right from the box - recognized in W7, self-updated FW, etc.
Also, for some reason the .inf file in the SFN6 folder being referred before DOESN'T contain 5152 at all.
Maybe the card is proprietary OEM...
Were you able to make your 5152F work?
Got exactly same thing - two single port cards from same ebay seller (different batches) ->
10G link fully working under ubuntu and "device driver cannot start" under Win 7, Win 10, Server 2008 R2.
All ECC REG.
However, I am recalling that I tried plain regular desktop DDR3 non-ECC (I believe G.Skill 2x8GB 1600) and it did work for sure - just with warning message during POST.
Try to check the jumpers "SYS ID" (bottom of the board) - mine all open.
Regarding the CPU and RAM:
I've been using X5670 and variety of Kingston, Hynix and Samsung DDR3 (1, 2, 4 and 8GB) and all did work.
Have you tested the CPU in another board? Any chances to try the board with another Xeon?