PMFJI, but that applies at all 32 vs 64 bit questions unless the extra memory accessibility is needed. Some programs claim that 64 bit is faster, but I have never seen a difference (if I can only tell by measuring, it is not a significant increase IMHO).
I have heard that 32 bit apps run faster under x64 windows than x86. I read it is something to do with the pagefile being virtual?
Cheers
DrT