considering for 4$ you can get the 440, which is already at 3 GHz, and a new stepping i believe, id go for that. its likely the best cpu for the money there is:http://www.newegg.com/Product/Product.aspx?Item=N82E16819103843&cm_re=440-_-19-103-843-_-Product
some people report it unlocking into a quad core, like the 640, a few amount report it unlocking into a quad core and having l3 cache, making it a B45. considering its a very fast cpu on its own, the unlocking is a plus, but it really doesnt need it. and typically in games, speed is much more important than cores, but that is starting to change a little bit. but not yet.