We must remeber that a processors performance can be limited by the components around it. A good processor needs a good motherboard, good RAM, good video card, good sound driver, good modem and good busses. Without these things the processor is limited in capability.
When i play some high requirement games against my mates my P3 733MHz loads faster than some P4's and higher spec P3's. But when a mate changed his motherboard and bought more costly RAM his computer went from loading slower than mine to absolutely hammering mine with no extra RAM capacity and no other upgrades. What i am trying to say is that the speed of a computer is not totally governed by the processor.