Not everyone stresses there cpu's using the same program. I am sure that different instructions heat more or less. Also with the cache on board, and redundant or repetitive instruction will not be recalculated over and over. So, some programs designed to keep the cpu hot may not work with newer chips.
A CPU simulator seems the only way to keep a stable even temperature. Some results with a cpu would be as varied as much as the tester because the heat load will be completely different!
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