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Enable SpeedStep support on any capable Intel CPU
Authored by: crazyates on Mar 11, '09 09:13:23AM

That same wikipedia articles also claims this:

"Mac OS also has SpeedStep built into the kernel, since the release of the Intel version of Mac OS X 10.4, and is already enabled."

A little digging and you can find other places that confirm this. I see no need for this hint, and I fear a lot of people are going to screw up their Macs.

If you are looking to control speedstep a little more, CoolBook is a good program. It lets you lock your CPU at a specified step, and apply custom voltages for further power savings. I tried it a while back, and the only side effect was ffmpegx would crash at the very end of a conversion, even with the factory settings. Thus, I havn't used it in months. That was with 10.4, I might give it a look with 10.5.



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Enable SpeedStep support on any capable Intel CPU
Authored by: outZider on Mar 11, '09 10:29:25AM

Unfortunately, when you pay for CoolBook, you're only paying for one machine. If you ever replace your MacBook, with, say, a newer MacBook, the author tells you to take a long walk off a short pier and pay up again.

I had a Mac that lasted about three months before I sold it off and replaced it, as it wasn't what you'd call "reliable". When I fired up CoolBook on the new machine, it told me I had too many machines active. When emailing the author, he let me know that I would have to pay up again. One could argue that it's so you can't run it on more than one machine at the same time, but the software phones home, he could deactivate one machine and activate another.

It's not an expensive piece of software, but man, did that turn me off. That being said, it's pretty clearly stated on the web site.



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Enable SpeedStep support on any capable Intel CPU
Authored by: mercurysquad on Mar 20, '09 07:28:05AM

The Wikipedia article (as expected) is wrong.

SpeedStep has not been built into the xnu kernel, ever. Clock recalibration code was present in older xnu versions, but this has also been removed. SpeedStep is controlled via an Apple-supplied kernel extension (driver) instead.



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