Originally posted by Andy Mecham
Does disabling AGP help?
Yes, it does. Apparently the GeForceFX models use the AGP bus more aggressively than a GF2 does, so motherboard instabilities are more apparent.
I managed to basically fix this problem (allowing me to re-enable AGP in the XF86Config file) by adjusting the BIOS settings for AGP drive. I had to change a number from the default of DA to E5. (Without having any idea of what that means)