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Does in fact work to under volt, though takes a bit of learning..
2.22 is the latest version. Not this one. Works with OSX Lion, Mountain Lion, and Mavericks, but you have to add the sleep enabler Kext and drop AppleCPUPowerManagement*.kext. Also have to uninstal and reinstall each upgrade that happens to OSx. Given there is no other option for this level of hardware control. 10/10. Keeps me 20 degrees C cooler!
Pros: Undervolts like it should.
Is Easy to implement
Cons: Troublesome to maintain, but worth the trouble.
Not Plug and play. Requires Workarounds.