Well got my L5640 yesterday and popped it into my Asus P6T with no problems. The best I can do is 3.6 stable but it needs a little over 1.4v. I'm not a great overclocker so im not sure what settings I can use for a better overclock. I don't know if I should keep this or go back to my I7 920 @ 4.2Ghz?