Intel or amd for gaming. will have a seperate gpu.
Intel have the best gaming processors by far. With AMD you get good value, but any new gen Intel will beat down nearly all AMD processors with ease, in the gaming/FPS stakes. Multithreaded apps may benefit more from AMD Octo cores, but even a high clocked quad I5 will still be right up there!
Just take a look at the various articles on Tom's and you will see.