I notice when playing Crysis 3 my GPU usage is low with my 290. But after overclocking my i5 to 4.5, my 290 is now fully being used and the game isn't choppy anymore. I thought an i5 at stock is supposed to suffice for all games since it's so praised as the best gaming CPU. Is there something I'm missing? Why am I required to overclock such a high-end CPU for playing a GPU demanding game? Was OCing implied by tech reviewers when telling you to buy the CPU (are you expected to do it)? Or is this situation just an exception?