Oh, and about your overclocking, if it is okay in the temperature boundaries, I say push it up! Just be extremely careful that it doesn't get too hot on you, because they heat up very quickly. And, make sure when you are running a graphical program and you want to check the temperature, make sure you don't minimize it or quit it, because the temperature can decrease more than 5 degrees (Celcius) in about 2 seconds. Maybe more... I don't really know.
But, hey, if you don't have any problems, overclock away! (Don't be too liberal, though.