Mac Pro 2009 with Yosemite DP7 and Expansion Slot Fan running at high speed

Discussion in 'Mac Pro' started by brosenz, Sep 6, 2014.

  1. brosenz macrumors regular

    brosenz

    Joined:
    Apr 26, 2011
    #1
    I just upgraded from Mavericks (10.9.4) to Yosemite (10.10 DP7) and now my Expansion Slot fan is running super fast all the time ~1,900 RPM, and with Mavericks it was always around ~900 RPM and now the computer is super noisy, any idea on how to fix it?, thanks
     
  2. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    Use SMCFanControl manually set the PCIe fan speed to 100%, give it few seconds to spin up, and then turn it back to the normal setting. The fan should slowly go back to the correct idle speed (800RPM).

    If nil help, perform a SMC reset + PRAM reset. And then use this SMCFanControl tricks again when required.
     
  3. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4

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