Bandwidth, latency, and Pifast
Let's start the ball rolling by looking at memory bandwidth and latency.
Note that the order in which the processors are listed will not be changed. 5 Intel CPUs headed by Pentium 4 570J at the top. A further 5 AMD Athlon 64s at the bottom, inevitably led by FX-55. Memory bandwidth, as reported by ScienceMark 2.0, looks better on dual-channel AMD processors. There's nothing much to choose between the Intel quintet.
Latency has always been an Athlon 64 forte. That's the main benefit of running a memory controller at full core speed, I guess.
Here's something interesting. Note how AMD's performance scales almost linearly with higher model numbers. Intel's, on the other hand, is convoluted by a couple of significant factors. Firstly, there's two cores at work here, Northwood and Prescott, both of which benchmark differently in Pifast. Secondly, a cache-laden Extreme Edition also upsets the apple cart. Choosing the right Pentium 4 is harder than you may at first think.
