The CPU doesn't play such a great role in 3D Mark 2005, the limiter is the GPU nice 3d mark results i got 5556 points with my 6800GT @ 410/1150MHZ http://service.futuremark.com/compare?3dm05=842295
but plays a few points believe me which are you settings i scored more than a 6800gt and 6800ultra :S that is weird and i can score up to 7k