Most games are Video card limited. Compared to what the video card does the cpu has a pretty easy job. Except for some games like Supreme commander and other RTS's. FPS games will always be GPU limited. There was a really good article I read about it a long time ago that explained it. It was old but the concept still holds. Just think about it.
The video card has all of the 3d rendering and physics now. The cpu has control input (light) network stack (light) sound acceleration (light) etc. Most of the time your cpu can get its work done at an equivalent2-300 fps, while the video card is getting its job done at around 60fps. Since the cpu is doing its work so much faster the system is limited by the GPU.
Better Than A Q6600! Ahhhh!
Not really. Compare.
Directupload.net - Daq4vcevs.jpg
19,297 | Thirdshiftdj | Q6600@ 3915mhz | Sapphire 3870x2 | Server 08 | ORB
That GTX280 does a little bit better at 3dmark 06 than the 3870X2. And the Q6600 has a slightly lower clock speed which can account for the small difference in scores.