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SpeedIt is a OS X Kernel extension and Preference Panel application designed for real-time CPU frequency, throttling and monitoring and on-the-fly adjustment of the CPU performance level on Intel Core Duo models via processor's power management model-specific registers (MSRs).

SpeedIt continuously monitors the CPU usage level and dynamically adjusts the CPU frequency, throttle and/or voltage level as needed and/or defined.

What's New

Version 0.5: Release notes were unavailable when this listing was updated.


Intel Mac. Tested on MacBook Pro at 1.83 GHz , MacBook Pro at 2 GHz, Mac Mini and iMac.

*Previously available here

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SpeedIt User Discussion

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xypher Member IconReview+54

Avoid, has bad code. Will cause low level damage. Not compatible with recent builds of OSX Tiger. Disabled my Audio so I had to do an archive and backup reinstall on my MBP to fix it. Not surprising that development has stopped on this dangerous program.

Reply0 replies
Version 0.5
albion Member IconComment+30

What does this do that OS X power management doesn't do already?

Reply2 replies
Version 0.5

It does a lot more but the prefpanel doesn't seem to be included so you have to use the command line. I'm guessing that this isn't submitted by the developer because it's not ready yet.

Marc Edwards

It can also be used to add functionality to the iStat suite of widgets and applications.

(more info at islayer.com)

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Current Version (0.x)


Downloads 63,734
Version Downloads 61,471
Type Utilities / System
License Free
Date 17 Jun 2006
Platform OS X / Intel 32
Price Free