I have a 2.8 Octo mac pro with 4 GB RAM and Geforce 6800GT. Right now I have 32-bit Vista Ultimate. I see that Bootcamp 2.1 now supports 64-bit versions of Windows. Should I upgrade to the 64-bit version? Would I notice any difference? I have a friend who would buy my 32-bit version, so it isn't l like I'd be losing all of money from the old one, just some. What do you guys think?