Dual video cards

[spekke]

Im trying a dual card setup. I get the both cards to work individually, but when both cards are inserted I get kernel panic or black screens when going into GUI mode.

Video cards:
Nvidia 8800GTS 512 MB
Nvidia G210 512 MB

Motherboard:
Asus p5k-e

Here's my plist for EFI-string:
rapidshare.com/files/417307193/fettdual.plist