Has anyone found a big difference using an ATI card on Intel vs using ATI on AMD? I know that there is a difference in pure horse power of the Intel vs AMD chips but does equal processors have different effects on graphics? Does this matter for ATI or NVidia?
If the CPU's are equal there is not going to be a difference in the graphics using the same GPU whether they are ATI or Nvidia.
With an AMD CPU you can use a nifty tool called ATI FUSION, which allows you to OC the GPU/CPU in tandem to get better results.
For gaming, AMD is better (as far as price is concerned), for video media/synthetics, Intel is better.