i wish my GPU rig was more stable, crappy PSU FTL!Also running a 1900GT here, how many seconds a frame is yours reporting? Also, are you running 3D clocks through ATITool?
Hint: GPU speed > RAM speed, I OC'd mine to 640MHz core and it does 2.2s/frame compared to the original 2.9s/frame. That's around 30% improvement.
