I have been waiting for a response from Nvidia on this issue.

Basically when a 7950GX2 is plugged into a 16X slot it automatically turns into an 8x slot, which is why the scores are so slow, the 8x is not the connecter but the state of the pci-e connection.

2 x 7950GX2 cards will NOT work on the ASUS A8N32-SLI motherboard and probably none of the last Nforce4 boards, maybe the new 570/590 and Intel editions will work