I agree with R-Tillery about ATI, but i also never had any problem with Maya on my MSI GF4 whichever the version of the drivers (original MSI drivers or the latest Detonator). I even managed to boost my GF4 to produce much better antialiasing ,texture quality... in viewports using some tools found on the net. I personaly didn't like it that way because of the performance drop, but those tools have many options and you might find an answer for your problems there. RivaTuner, for instance, has many options for both nVidia and ATI video cards.