Exactly what are the advantages of 64bit over 32bit? Will it make much difference when gaming? Gaming is really the only reason I'd use a 64bit operating system if it made a big difference in gaming... What about overall performance on 64bit? Will things run noticeably faster? I'm trying to decide if I should stick with my 32bit XP Pro until I can afford to fork out money for Vista Ultimate... Or just stick with XP Pro... Speaking of which... How big are the differences between Ultimate and Home Premium? Is there an in-between version between home premium and Vista that is better than Home Premium but not as good as Ultimate?