When Should Fans Speed Up?

Discussion in 'iMac' started by Jthall502, Aug 2, 2013.

  1. Jthall502 macrumors newbie

    Jthall502

    Joined:
    Jun 27, 2013
    Location:
    Louisville, KY
    #1
    I have a new Imac 27" and was encoding a Video using HandBrake. I decided to check my temps using Temperature Guage app. It said My average CPU was 89 C but my average fan speed was still around 1100rpm..

    Is this normal, at what point will the fans kick it up a notch?
     
  2. jav6454 macrumors P6

    jav6454

    Joined:
    Nov 14, 2007
    Location:
    1 Geostationary Tower Plaza
    #2
    If you see CPU temps soar and the fans don't kick in, then check two things first.

    1. Fan sensors
    2. Fan air output

    If either of those doesn't match, then you may have faulty thermal regulation and prolonged heating may cause damage.
     
  3. Jthall502 thread starter macrumors newbie

    Jthall502

    Joined:
    Jun 27, 2013
    Location:
    Louisville, KY
    #3
    So should my fans have been running faster at those temps?
     
  4. jav6454 macrumors P6

    jav6454

    Joined:
    Nov 14, 2007
    Location:
    1 Geostationary Tower Plaza
    #4
    Theoretically, yes they should. 87*C is quite high.
     
  5. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #5
    It wouldn't hurt to try resetting the SMC. However, fans may not spin faster unless sufficiently high temps are sustained for a period of time. The ambient temp of the room plays a role, as well. It's common for fans not to spin faster on temporary spikes in temperature.
     
  6. snapdragonx macrumors regular

    Joined:
    Oct 31, 2012
    #6
    My imac is the same, I can encode video for 10 minutes and the fans don't kick in at all (past the default speed). Those CPUs are good for 105 degrees, but I personally don't like it getting that hot so I use an app to control the fan speed.
     
  7. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #7
    Also don't forget it's very, very common for the fans in a aluminum iMac to never spin up from their idle speed unless there is a hardware fault.
     
  8. WilliamG macrumors 604

    Joined:
    Mar 29, 2008
    Location:
    Seattle
    #8
    I've found the fan more likely to spin up under GPU load than CPU load.
     

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