I'm currently running ver .113 on my P4 2.4ghz spare computer in my cab. With the new 64-bit optimizations of Mame, would it be faster to run it on a Amd64 3700+ (2.2ghz) running windows xp64? I'd be losing .2 ghz of processing power, but upgrading to the 64 bit build. Secondly, have there been any benefits yet to using dual-core processors? Wondering if any Core2Duo owners have found marked improvements over a single core setup.