i love xp, how much faster does the x64 version run than the 32-bit version (obviously considering you have the necessary hardware)?
It's not worth it. Only certain programs work with it and people just tend to stay away from it because of compatibility issues.
i assume you are referring to xp x64 and not vista, correct?
I don't know how Vista 64bit will be, but XP x64 has tons of compatibility issues. Very few 32bit programs work flawlessly, and many 64bit very buggy.
Microsoft hoped that since the Athlon 64 was out a bunch of people would jump on XP64 but it never happened, hardware makers never really put much time in making good drivers for it or any at all!