Last month I changed mobos and decided to install the 64 bit version of Win 7 since it should be faster than the 32 bit version I was using. Instead, the system felt less responsive so I thought perhaps the new mobo was to blame. Last weekend I changed to a clean install of Win 7 32 bit and the system seems more responsive. Does running 32 bit apps in a 64 bit OS incur some kind of performance penalty? Just browsing through folders in explorer seemed somehow less snappy so I'm thinking the OS might have been the issue. Anyone else notice this?