ive tried every detonator driver from 5.14 til present (first off on a nvidia tnt2 vanta 8mb - and now on a hercules 2mx twinview 32mb [both agp]).
every single driver gave me no gain in performance, nor any less performance... on both cards. The early 6.xx drivers for Win9x caused WinME to BSOD on shutdown, but apart from that, all drivers are the same. I think I'm currently using the 40.72 (I only updated a week or so ago) and these havent increased performance over any of the previous drivers tried on either of my nvidia cards.
just goes to show... nvidia are talkin garbage when they say it gives you a 20% gain in performance. I bet their 20% improvement is down to their better cpus + ram in the testing systems rather than their graphics drivers imo