We already know what a beast the Galaxy S2 is with its 1.2Ghz dual core CPU. Apparently this wasn't enough for a user over at XDA forums who achieved a stable overclock of 1.5Ghz. The result is over 4000 Quadrant points. This is no custom kernel with quadrant hacks or anything, this is pure unadulterated 4000 points on quadrant. You will obviously need a rooted phone, and balls of steel to achieve this.

Source: XDA