Macbook Pro Always Hot from Thunderbolt Displays?

Discussion in 'MacBook Pro' started by MBPJohn, Oct 6, 2016.

  1. MBPJohn macrumors newbie

    Apr 9, 2013
    Recently I've been trying to figure out why my Mid 2012 fully maxed out Retina Macbook Pro keeps running hot for no reason. The activity monitor is barely showing any signs of stress yet the computer runs at 150 degrees with the fans on full blast.

    A few days ago I took the laptop with me on a business trip and noticed in the hotel room the laptop did not touch more than 120 degrees no matter what I was doing. The moment I get home and I plugged in my dual thunderbolt displays and continue to do the same work, the laptop goes to 150 degrees.

    Can the displays be stressing my Macbook pro out? Is there a fix to this? I am running a

    Mid 2012 Macbook Pro Retina
    Latest Version of El Capitan
    2.7 GHz Intel Core i7
    16GB of Ram
    750GB Solid State Drive
    Dual Thunderbolt Displays
  2. tubeexperience macrumors 68040

    Feb 17, 2016
    When connected to the external monitor, the dGPU always run.

    It still shouldn't get that hot. Maybe you need to clean the fans and apply new thermal compound.
  3. keysofanxiety macrumors G3


    Nov 23, 2011
    When you plug in the display, it will run from the dGPU. Your model of rMBP has a documented issue with graphics.

    It has a repair program, so Apple can likely sort it free-of-charge if you visit a store:
  4. maflynn Moderator


    Staff Member

    May 3, 2009
    As mentioned, you are pushing the system harder because you're now driving another monitor and the dGPU has to work harder, and hard work = heat.

    Are those temps Celsius or Fahrenheit?

    If Fahrenheit, the temps are not that bad, if Celsius, then the system should have shut down when you reached the 100c threshold.

    Also you may want to think about cleaning out the innards, after 4 years dust may have worked inside of your computer and limiting the usefulness of the fans.
  5. MBPJohn thread starter macrumors newbie

    Apr 9, 2013
    Thanks for the replies guys. Sorry I didn't make it clear but its Farenheit haha. If it was celsius it would have probably melted.

    How do I clean the fans? is there a guide you guys can link me to? Thanks

  6. tubeexperience macrumors 68040

    Feb 17, 2016
  7. MBPJohn thread starter macrumors newbie

    Apr 9, 2013
    Thanks for the link tubrexperience.

    I disconnected one of the Thunderbolt displays and the computer is running a lot smoother. Hmm I really need the 2 thunderbolt displays for work though. I guess my only solution is to get a Mac Pro?
  8. tubeexperience macrumors 68040

    Feb 17, 2016
    MacBook Pro are intended to be portable. Having it output to 2 thunderbolt display is pushing it hard.

    Mac Pro is outdated and seriously overpriced.

    I guess you can look at getting an iMac and using it with a second display.

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7 October 6, 2016