Loud Fans - Only in OS X?

Discussion in 'iMac' started by Goftrey, Feb 14, 2013.

  1. macrumors 68000

    Goftrey

    Joined:
    May 20, 2011
    Location:
    Wales, UK
    #1
    I received my late 2006 17" iMac yesterday and am absolutely chuffed with it. However, OS X is handling the fans in a very odd way; I downloaded smcFanControl (as I do on every Mac I own) & was looking (& listening) to the fan sensors. Idling, the ODD & HDD fans are at 4000rpm, whereas the CPU is only at 1000. It's making quite a noise. Then, when I boot into XP via Boot Camp, every is silent, even when playing a pretty intense game. Is this natural? Are the fans automatically defaulted to a higher RPM in OS X? I'd just like to find out if it's a software issue before opening him up & taking a gander myself. Thanks.
     
  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2
  3. thread starter macrumors 68000

    Goftrey

    Joined:
    May 20, 2011
    Location:
    Wales, UK
    #3
    Just performed the reset & it's still idling at 4k.
     
  4. macrumors 68040

    Joined:
    Jul 11, 2009
    #4
    It's not truly idling then. Open Activity Monitor, set it to show all processes and sort by CPU%. Something is making it work.
     
  5. thread starter macrumors 68000

    Goftrey

    Joined:
    May 20, 2011
    Location:
    Wales, UK
    #5
    Not a lot going on there..
     

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  6. thread starter macrumors 68000

    Goftrey

    Joined:
    May 20, 2011
    Location:
    Wales, UK
    #6
    Okay, I just installed Fan Control & found the base rpm is set at 3500rpm. So I set that down to 1000 & have been doing various stress-tests while keeping an eye on the temps. The iMac is now dead-silent & none of the temperatures have shot up at all. Little bit weird but everything's all good now. Thanks for the replies :)
     
  7. macrumors newbie

    Joined:
    Jul 26, 2006
    Location:
    Denmark
  8. macrumors 603

    Joined:
    Mar 29, 2008
    Location:
    Seattle
    #8
    Doubt it. Probably the factory-default speed. On the 2012 27" iMac it's 1200rpm.
     
  9. macrumors regular

    Joined:
    Jul 21, 2010
    #9
    I know this is totally unrelated, but on my iMac (a 2010 model), the fans only get noisy in Windows, when playing video games. And even then, it's not load at all. I wonder how this is related to the significantly superior performance of games in Windows compared with Mac OS X...:rolleyes:
     

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