Severe Throttling Using External Displays (MBP 2011)

Discussion in 'MacBook Pro' started by matty1551, Feb 4, 2015.

  1. matty1551 macrumors 6502

    Jul 7, 2009
    I have run various cpu intensive tasks in regular mode (built in display, no external) and in clamshell mode. I have noticed that all tasks take 2X-3X longer in clamshell mode.

    I downloaded intel's power gadget and ran all the tasks again, this time monitoring clock speed, power consumption, and temperature.

    TESTS in Clamshell Mode: ~1.0GHz, 8W, Temp: ~75c.

    TESTS used regularly :~2.4 GHz, 35W, Temp: 85-90C

    The temperatures in clamshell mode never reach any higher than non clamshell temps so there is really not reason for the throttling at all. Sometimes on boot, it is already throttling before I've even gotten things up to operating temperature.

    Is this acceptable? I'm not even getting anything close to advertised performance here. Hoping to take into genius bar soon but want to go in with a solid case here.

    I've tried PRAM reset and have also tested this on multiple OS's.
  2. Samuelsan2001 macrumors 604

    Oct 24, 2013
    Have you tried...

    Connected to an external display and open????

    If that is normal then it is probably a clamshell mode setting coming into play.
  3. matty1551 thread starter macrumors 6502

    Jul 7, 2009
    External display and laptop open yields similar results as clamshell mode.
  4. MkVsTheWorld macrumors regular

    Jan 20, 2010
    I'll have to try it and report back. Which size is yours?
  5. matty1551 thread starter macrumors 6502

    Jul 7, 2009
    Yes, please do and report back.

    Mine is Early 2011 MBP 15" 2.2GHz i7

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4 February 4, 2015