Haswell MBP fan noise on high cpu usage

Discussion in 'MacBook Pro' started by spacht, Jan 2, 2014.

  1. spacht macrumors newbie

    Jan 2, 2014
    While running some benchmarks and trying out some games on a new late 2013 rMBP i noticed that the machine runs very quiet on heavy GPU usage, even for hours, but gets very loud after even a few seconds of 100% CPU load.

    Running Cinebench R11.5 the CPU core temps reach 100°C in a few seconds with the fans spinning up to 5000/4500 rpm (left/right) moments later. After the test the fans turn down as quickly.

    Is this normal behavior or might it be a bad paste job or something? This is my first Macbook and my first high-performance notebook in general.
  2. dusk007 macrumors 68040


    Dec 5, 2009
    That is normal. Even worse on mine I think. If I run handbrake mine hits full fan speeds very quickly.

    The CPU has a standard TDP of 47W and with Turbo 55-60W are possible for short bursts. The GPU is around 30W so it is a much cooler chip. Apple also disabled all turbo features a 750M would normally have.
    The true TDP of a 750M is not published but based on the designs it can fit into one can guess.

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