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Back In The Day, before Windows implemented calling the HLT instruction in the idle loop, overclockers would run a userland program that did the same thing, called cpuidle.

http://screenshots.en.sftcdn.net/en/scrn/5000/5197/cpu-idle-...

http://www.cpuidle.de/news.php

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There was actually several of them used by overclockers. I was always a fan of "waterfall". It made a huge difference in the CPU temperature!

http://estu.nit.ac.jp/~e982457/other/cpuidle/idle.htm

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