What driver do you have setup for x-windows? You should be using nvidia, not nv or vesa. Look for "Driver" in your XF86Config-4 (or appropriate config) I am running a PVR350 + TNT2 (video out) + P3 800-EB with no probs (it is my front and back end) ... it does have 1GB of ECC ram though :-P (old server mb) S