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…otherwise known as Green IT…
http://en.wikipedia.org/wiki/PowerNow!
http://en.wikipedia.org/wiki/Cool%27n%27Quiet
http://en.wikipedia.org/wiki/SpeedStep
PowerNow! - AMD CPU frequency scaling Cool'n'Quiet - AMD CPU frequency scaling for desktop CPUs
Optimized Power Management - AMD CPU frequency scaling for newer Opteron CPUs
SpeedStep - Intel CPU frequency scaling
Enhanced Intel SpeedStep (EIST) - Newer name for SpeedStep