That's very interesting. What I have observed is that all 3DMark05 10000+ score systems had overclocked Nvidia 6800GT cards along with the overclocked AMD 64 processors. It appears that AMD has some optimization for graphics intensive applications. The fastest P4 with the Nvidia 6800GT card gives scores around 8000+. The fastest AMD system gives scores of 14000+ using the Nvidia 6800GT, overclocked of course.
However, the total system may not be any faster. The 3DMark05 is just one test, afterall, and could be biased towards AMD. Still, there is some distinction in the graphics performance between the AMD 64 and Intel for now. It could also be that there are more system tweakers using AMD processors.
Regards,
Malta