the 3.xx series work the best for me out of all the drivers for my tnt2 ultra, including the latest 6.xx, i've used the 3.90 but it didn't prove as stable as the 3.79 whql drivers, reactorcritical.com has the 3.90 you're looking for, but you should try the 3.79 & 3.90 on 3dmark2000 & see which one performs better & is more stable.