The drivers aint the problem boys.
I have a 900mhz amd athlon with Leadtek geforce 2 MX 400 64MB
and frames are:
5856 frames in 5.0 seconds = 1171.200 FPS
5760 frames in 5.0 seconds = 1152.000 FPS
5924 frames in 5.0 seconds = 1184.800 FPS
6426 frames in 5.0 seconds = 1285.200 FPS
i think you guys didnt install the drivers the goodway. Anyhow your colors have to be on 16bit cause using 24bit or more disables your 3D on the system. is this the problem??
Did you guys uninstalled the old or dummy nvidia drivers before installing the new official ones??
have you entered the "switch2nvidia" with root on your console??
Try a 3Ddiag and c what i tells you.