Just got my Athlon XP yesterday and well I read somewhere that I should reinstall the OS after upgrading to an Athlon XP because the cpu has SSE and windows is suppose to make use of it. But only after a reinstall. I don't know if that's true or not. What do you guys think? Don't really want to do reinstall cause otherwise I'll probably be spending the whole day resetting it up. But hey I guess for the performance benefit it's worth it right.