Try using the program Cpu Burn-in. With processors using cached routines, you need a program that uses most of the instruction sets to generate the heat of a 100% cpu load. Try it out and see.
Quote:
CPU Burn-in v1.0 by Michal Mienik is the ultimate stability testing tool for overclockers. The program heats up any x86 CPU to the maximum possible operating temperature that is achievable by using ordinary software. This allows the user to adjust the CPU speed up to the practical maximum while still being sure that stability is achieved even under the most stressful conditions. The program continuously monitors for erroneous calculations and errors ensuring the CPU does not generate errors during calculations performed under overclocking conditions. -quote from text file in app.
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