Why am I Constantly Being Throttled?

Discussion in 'MacBook Pro' started by matty1551, Dec 24, 2014.

  1. matty1551 macrumors 6502

    Jul 7, 2009
    Is this normal? I've never noticed before but doing anything CPU intensive results in an almost immediate CPU throttle.

    This is with a 2011 MBP 2.2Ghz quad core i7 running 10.8 with all updates.

    My temperatures appear normal and my fans are not running loudly so I don't understand why this would be happening

    My handbrake encode is estimating 3.5 hours for a single 1080P movie.


    This is another test using "yes" commands in terminal to max out the CPU. There are 6 instances running but the temperature only rises slightly.

  2. Intell macrumors P6


    Jan 24, 2010
    Is you machine plugged into power or running on the battery?
  3. someoneoutthere macrumors regular

    Jul 27, 2014
    The Great Lakes State
    It seems to be plugged in - at least that's what the icon says.
  4. matty1551 thread starter macrumors 6502

    Jul 7, 2009
    Always plugged in. I was using it in clamshell mode. I unhooked my external and ran the same tests again and the machine is increasing in clock speed and heating up as expected.

    Not sure why the external display would cause this though.

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