For the heck of it, I tried setting doom 3 to 16x12 at the high quality setting on an amd xp 2500+, NVidea 5900, 1 gig ram, etc, and it ACTUALLY RAN WELL... EXCEPT..
Whenever there's a scene where "warping" occurs, my framerate drops to 5 fps or less. Basically, when there are scenes like...