Do we need more CPU power?

[rgathright]

Would it be more "Do you need more CPU power to improve the GPU performance you add."?

After all they are HUNGRY heat-breathing Crunch Monsters sometimes! I myself need to double my
AMD cores to feed the 2 GPU's I already have in one machine.

I leave four cpu cores free on my AMD Opteron box just to feed two NVIDIA GTX 550 Ti's.