How big of a difference would I notice changing from my AMD phenom II 805 2.5ghz, to a Phenom II X4 955 3.2ghz processor? I mean is it worth upgrading or should I just keep what I have? Oh and I need some advice on changing from windows 7 32bit to windows 7 64bit and adding 4 more gigs of RAM I know if i did both of these i would notice a huge change, but just need some advice.