Just noticed this on my trawls of the web – an ACPICPUThrottler kext has been made by mac.nub that works with OS X 10.4.8 and 10.4.9 with Intel CPUs. If you visit his website here you can download the latest version and fine news. This will enable SpeedStepping on both SSE3 and SSE2 processors and works with the new kernels. This is meant as a replacement for the official Apple ACPICPUThrottler.kext.

Latest version is v1.01 here.

Mirrored the kext here.

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