Ok. Your post, especially after the previous post did make it look that way though.
Personally, I felt the gaming cards upto 1800XT worked ok, but after that, the 2xxx, 3xxx and cards like 8600GT(really bad) gave Maya viewport corruptions even though they were able to pull in considerable speed in the viewport. You could notice this sometimes while painting weights on vertices. Having said that, I am not sure about the Maya viewport performance of the current generation of gaming cards as I hardly do any such work at home anymore.