performance boost in what? Also overclocking does not scale 100%. This means if you increase the clock speeds by 20% you will not get a 20% improvement. If you are testing for games, it depends more on the graphics card because the 2500k can handle all the games no problem.
On another note, if you are using the stock cooler for overclocking, it might be overheating and you will lose performance.
well its more the game giving the problems the game only is 2 weeks old so it will be awhile for it to be running perfect i was hoping to find work around for better perfromance before that from what i read it is a cpu heavy game