eh.... if your on a budget, then go and buy 2700. Its not to slow and not to fast. But if u have the money get 3200. As for the FSB. 533 and 800... i would say if your gonna be running a lot of programs at once and stuff, then get the 800. If not then get the 533. I have the 533 and its fine. But i mean u may be running different things.