From Tweaktown :
Of course, the article shows other games where the CPU speed, > 4 cores, shows little or no fps improvement:
So I guess the upshot is that both the "GPU is the limiting factor" and the "CPU makes a difference" camps are correct, depending on how the game is written..
You can see, at 2560 x 1600 there’s no CPU limitation; instead we’re only limited by our video cards. At 1920 x 1200 and 1680 x 1050, though, there’s a clear CPU limitation with the difference between the 3.06GHz clock and 4.2GHz one being extremely large.
Of course, the article shows other games where the CPU speed, > 4 cores, shows little or no fps improvement:
So I guess the upshot is that both the "GPU is the limiting factor" and the "CPU makes a difference" camps are correct, depending on how the game is written..