neither is my answer. I have used a few nvidia cards such as the TNT2, Geforce 5200, and the 6200. Ive used 2 ati cards however the x800 Gt and x1800gto. From my experience I have had lots of problems with nivida such as the TNT2 screwing up after a while and the 5200 drivers that wouldnt recognize the card and the 6200s crappy turbo memory. Soooo if I had to pick it would be ATi although when I had XP installing the drivers from a fresh install required the .net framework 2.0 to work correctly was a big pain to install sometimes. Oh yea I forgot that I had 2 nvidia Geforce 4 mx4000 which both broke after 6 months o hail the nvidia cards lol