Kernel Task Extremely High CPU

Discussion in 'macOS' started by phaselocked, Aug 25, 2016.

  1. phaselocked macrumors newbie

    Dec 5, 2011
    Hey guys,

    Lately I have an extremely high CPU usage by kernel task (500+%). I've noticed that I can only reproduce this when 1. connected to an external screen 2. also connected on a USB hub. As soon as I use my Macbook Pro Retina 15" (late 2013 GT 750M) without all the connections the problem goes away.

    Might this be caused by the hub?

  2. phaselocked thread starter macrumors newbie

    Dec 5, 2011
    SOLVED: The fans were covered in way too much dust. Fans got cleaned up and now everything works fine!
  3. grahamperrin macrumors 601


    Jun 8, 2007
    Yeah, I had that more than once in the past with a MacBookPro5,2. I watched the cleaning by an AASP, it's amazing what gets inside …

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