No... what I mean for example is Vista x64 with a 64 bit processor (obviously), the only 64 bit software being used is the OS and the 64bit version of IE. Nothing else is going to be faster, and software still today does not go nearly as fast as it could, I would bet money that firefox runs just as fast on a P4 as it does on today's processors (on a CLEAN system with no other junk, just the OS and firefox)
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