Considering that the CPU score is greatly increased if PhysX is enabled, that's not even a very good CPU score.
I'm going to guess there is something not quite right. I'd start by reinstalling your drivers, and doing a clean sweep of old drivers not in use, such as older ATI drivers if you changed from one.
Next, if that doesn't work, I would run GPU-Z and make sure your card is running at PCIe x8 or x16.
If that doesn't work, you might check memory and or PSU.