Diminishing Returns Kick In:
CPUs priced over $230 offer rapidly diminishing returns when it comes to game performance. As such, we have a hard time recommending anything more expensive than the Core i5-3570K, especially since this multiplier-unlocked processor can be overclocked to great effect if more performance is desired. Even at stock clocks, it meets or beats the $1000 Core i7-990X Extreme Edition when it comes to gaming.
if you take a look at the ticker for Futermark you will notice that some times there will be people that score hundreds or thousands of points higher than other benchmarks with similar components, and they always have high end mobo's and chipsets.