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Another problem I have is that the temperature gradient across the surface of the cpu may be alot greater than with a die simulator. It may possibly even change patterns with different load programs. One block could perform better than another with prime95 and perform worse with cpuburn.
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You will have all sorts of problems when you use CPU loading programs that don't run completely in the cache. Then you are at the mercy of the motherboard's communication with hdd and ram and other complications. Reproducibility isn't so good at that point.
And as the main difference between Prime95 and K7Burn is that the first accesses system memory, I doubt that one would result in a different ranking than another on Athlons or P4s.
It brings up an interesting point though: How about the integrated memory controller of the A64? How hot does that get, and could whether a program accesses system ram or not make a big difference in temps? Something I hadn't thought of before (wish AMD were as free with tech docs as Intel is).