A CPU will not make the game get more frames per second period and all the OCing on the AMD CPUs will do is alleviate the bottle neck and put it back onto the GPU where you want it to be. You will not see much more if any frame rates if you are OCing the Intel 2600K because it is already feeding the GPU to the max. The 8150 should catch up to the stock clocked 2600K in this game when it is OCed to around 4.5Ghz or more.
Your baseless guesswork is interesting and irrelevant. Moving the bottleneck to a different part if your system doesn't make a shitty processor good. You can polish that turd all you want, it's still a turd.