What is thermal throttling

Monitor and control CPU thermal throttling in OS X

I recently came across the Intel Extreme Tuning Utility for Windows. I tried it under Bootcamp Windows and it was very interesting to find out in which situations the CPU of my MacBook Pro (mid-2012) is thermally throttled. The tool is also used to change the CPU voltage to reduce thermal throttling. However, this option was not available.

So my questions are:

  1. Is there a similar tool for monitoring CPU (thermal) throttling on OS X (Yosemite)? Answering this part entitles you to accept the answer ;-)
  2. Why was the option to change the CPU voltage under Bootcamp not available? Is this function not supported by my CPU (i7 2.6 GHz Ivy Bridge 3720QM)?
  3. If my CPU is able to change its voltage, is there any way to decrease the CPU voltage in OS X?

Disclaimer: Yes, I know this could potentially damage my hardware. No warnings necessary ;-)


To monitor throttling, you can do the following:

In terminal and watch output:

If in some moments it is less than 100, it means that the CPU is throttled.

I would also like a utility to perform this function.

I don't know how to monitor this in OSX, but there is a way to reduce it: SMC Fan Control. This utility allows you to manually adjust the speed of your fans, which will cool the machine and reduce the throttling a little.

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