So I was merrily specifying a machine for a customer & I'd done the kit bit & then I wrote 'xp64 .." .. which was fine & dandy until he said 'why?' & then really I was struggling to justify matters ..

Anybody find me any benchmarks that compare like for like & aren't based on a beta version of xp64 ? (or got any other comments about the differences)

Machines 'feel much faster' with xp64 on 'em, but I'm wondering how much of that feeling might be just wishful thinking ?