of course it would whoop a 2ghz p4, because the p4 is crap. It is supposed to seem to run at 1.5 ghz , but id say the p4 is probably as good as an athlon 1.2, except mad more expensive. Anyway an athlon xp 2000+ (1.67ghz) could eat that mac up let alone a dual xp setup. The gf4 and everything is nice, but such a waste in a mac.