In the newest processor series Intel introduced the "K" series processors, these are the only processors capable of overclocking. If you don't have the "K" edition don't even bother overclocking since the method explained in the video in the comment above (http://www.youtube.com/watch?v=wnH0luwrcfE) won't work at all. Using other methods you might be able to get another 100Mhz out of it.