I am going to side with Tench on this one. Current PCs are really HD constrained. I have an A64 which when zipping,raring, etc. is not cpu bound at all. It seems that my HD is the bottleneck. I use cool n quiet so I can see what the cpu is doing in real time and I rarely see the cpu run faster than 1Ghz. Occasionaly it will blip up but it returns to 1Ghz almost immediately even when doing really cpu intensive stuff. As long as Windows uses the disk so much cpu speed will become more and more irrelevant. I think the current crop of cpus is so fast that the average user does not the difference when going from a 2400+ to a 3400+ which is the current sweetspot. What does make a difference is that Pcs with high end cpus usually get high end drives in them.
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