The results look plausible for the 9800GX2 based on these results:
Keep in mind, 3dmark06 is not CPU reliant. The reason it affects the score so much for people with liquid nitrogen cooling and do test runs at 6+ GHz is because the speed of the CPU is extremely out of proportion with the GPU and has a much larger effect on the overall score. With a powerful enough GPU, the opposite could easily be true.
These results look a little optimistic, but damn, if they are true... ATI is in the gold, and I would be snapping up two 4870X2s
go from a dual to a quad you get a huge gain.
overclock the cpu and you get a decent gain also.
I'm not talking 20-30points either you gain quite a bit on all the scores from cpu to even the shaders