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Enable SpeedStep support on any capable Intel CPU
Authored by: mercurysquad on Mar 20, '09 07:25:21AM

I'm the author of the kernel extension this post links to.

I'd like to point out a couple of important things, to minimize any damage:

  1. Do NOT use v1.4.5 — that is beta software intended to test a few features. There have been reports of kernel panics. Use v1.4.0 which is the latest STABLE version.
  2. You must disable or remove AppleIntelCPUPowerManagement.kext before you can use this kext. The recommended way is to install PMdisabler.kext (find it via Google) which will disable the Apple kext without having to remove it.
  3. Before you install the kext into your Extensions folder, you should set its permissions and test-load it to make sure it works -

    sudo chown -R root:wheel ~/Downloads/IntelEnhancedSpeedStep.kext
    sudo chmod -R 755 ~/Downloads/IntelEnhancedSpeedStep.kext
    sudo kextload ~/Downloads/IntelEnhancedSpeedStep.kext

    If your computer panics at this moment, do NOT install the kext.

  4. If you installed the kext anyway, and cannot boot your mac anymore, simply boot up with [b]-s[/b] option (single-user mode). The kext does not load in single-user mode. You should then delete the kext from the command line by mounting your harddrive (commands are given when you boot) and then rm -rf /System/Library/Extensions/IntelEnhancedSpeedStep.kext
  5. Hope that helps.

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