Highend CPU's vs High End Graphics cards

We took the Radeon x800 Pro and Radeon x800 XT, GeForce 6800 GT and GeForce 6800 Ultra and started measuring performance on that Pentium 4 2.8 GHz system and then did the exact same thing on the Athlon 64 3800+. Now before we beging I need to make clear that you need to see things in relation to the processor. A faster CPU obviously means a newer platform thus a newer mainboard and memory utilisation also. Primary the advantage will come from the CPU though