I think I have tried every single method to make the card work, but it keeps saying this at boot:
Bad display config block signature (0x8b262275)
ERROR: nVidia ROM patching failed!
The computer still works, but without the second monitor or the nVidia graphics card active.
CPU: Amd Phenom II x4 965 (OC'ed but 100% stable)
MOBO: Gigabyte MA790GPT-UD3H
GFX: XFX ATI 5850 1GB (OC'ed but 100% stable)
GFX: Inno3D nVidia 8600GT 1GB
RAM: 3x 2Gb OCZ 1333Mhz cl7