Ok, so processor does make a big difference

Yeah it's how the 3Dmk06 works, and it's not like a game in that many areas are stressed in a way to simply max out the DX features/support of a system. However unlike 3Dmk05 and 3Dmk03 this iteration is very CPU sensitive once you get to higher scores.

When the GTX first came out it was shown that on older PCs the GTX and the GX2 shared the same score around 8K, but to get beyond that you need to have a very fast CPU, which then allowed the GTX to add a couple of K to it's score. This boost was much larger than that felt in 3Dmk05, which still benifits from a faster CPU, but not as dramatically.