I'm going to overclock them to the same final speed. I'll end up dropping the multiplier on both and bumping up the FSB.
So the difference comes down to the extra L2 cache and the difference in system bus speed interacting with the memory.
From what I've been reading, the faster system bus speed can increase memory bandwidth, but the system usually needs to introduce a higher memory latency to make everything play nice together, so the net result may not actually be better overall performance, depending on the actual application you're running.
I wish it was easier to swap CPUs for benchmarking.
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