Hey thanks, I was always doing the 3G switch and not this.
Basically, the only advantage of Vista 64, is that you don't need to do the 3GB switch on the OS, but you still have to patch FS9.EXE
However, there is some overhead running a 32 bit apps into a 64 bit OS, because every 32 bit API call the apps makes, needs to be translated at runtime by extending its parameters to 64 bit, with a process called "thunking" so, the same app might be more stable because of the extended memory available, but it will surely not run any faster, and possibly slower.