This guy here is claming that 3dMark05 & the drivers provided by 3dMark05 are optimized by NVIDIA & are chating, so 3DMark05 is invalid, however he didn't gave any source for that
http://www.thinkdigit.com/forum/viewtopic.php?t=7614
http://www.thinkdigit.com/forum/viewtopic.php?t=7614
