iMac Fans not revving up?

Discussion in 'iMac' started by NintendoRev, Jul 15, 2014.

  1. NintendoRev macrumors member

    Jul 1, 2013
    So i've had my 27" 2013 iMac for a month now and i'm kind of concerned. The fan never seems to rev up properly when doing something intensive like playing a game (Team Fortress 2). It's consistently at 1200 RPM. Is this normal at all?

    My GPU was getting to above 70c earlier when I was playing and I'm kind of worried it's going to damage the system :S
  2. Dreadnought macrumors 68020


    Jul 22, 2002
    Almere, The Netherlands
    Is normal. 70 degrees is normal operating temperature for a cpu. They can go as high as 95 degrees before shutting down. Please note that the back of your iMac is one big cooling element.
  3. joe-h2o macrumors 6502a

    Jun 24, 2012
    Totally normal.

    The fan won't even begin to ramp up until well beyond 70 C.
  4. yjchua95 macrumors 604

    Apr 23, 2011
    GVA, KUL, MEL (current), ZQN
    My fans don't rev up even during heavy tasks, unless it's Battlefield 4 or heavy video editing.

    This is because the iMacs have a very good ventilation system, so the fans don't have to rev up unless the temperatures gets high enough to trigger the fans (85ºC and beyond, usually).
  5. quagmire macrumors 603


    Apr 19, 2004
    Apple values quiet operation above all else. So the fan won't spin up until it gets really hot. I'm not comfortable with my GPU reaching 80 C so I bought istat menu's and manually ramp up the fan when playing x-plane. Cools it down to a nice 62 C.
  6. MartinAppleGuy macrumors 68020


    Sep 27, 2013
    I have never heard my iMac's fan rev up either. Don't worry about it.
  7. cynics macrumors G4

    Jan 8, 2012
    Only when the CPU gets hot do I see the fan profile become more aggressive. Not so much with the GPU.

    I've seen games run the GPU around 90 degrees.

    That seems a touch bit excessive for extended use to me so I manually set the fan to maintain 80-85 degrees (around 1800 RPM for ESO).

    If nothing else it gives me peace of mind.
  8. NintendoRev thread starter macrumors member

    Jul 1, 2013
    Thanks guys! Didn't realize the cooling system allowed for the temps to get up that high before increasing the speed. I'm so used to my old PC when it comes to gaming, which would get insanely loud when doing anything gpu intensive.
  9. joe-h2o macrumors 6502a

    Jun 24, 2012
    If you install a fan control app then you can make the fan run at full chat just so you can hear what it sounds like (a gentle whooshing), but during normal operation (even with really heavy CPU and GPU use) it will almost never run that fast on its own.

    The iMac is very quiet, even under load.
  10. Th3taJ macrumors member


    Jul 14, 2014
    Milford, NH
    In the few month I've had my iMac, I've played much higher-end games than Team Fortress 2 at peak performance.

    I have yet to hear my fan really push and performance has never notably faltered so I've never worried about it.
  11. NintendoRev thread starter macrumors member

    Jul 1, 2013
    That's great to hear! thanks man! =D Makes me a bit more confident in my purchase.
  12. Fatboy71 macrumors 65816


    Dec 21, 2010
    Thats perfectly normal. I have the Late 2012 iMac and the fan is nearly always 1200 RPM. I have only heard it rev up once since I got the iMac, and that was on a hot day and when I was encoding some video. Even then, it was only a very brief rev up and it then slowed back down.
  13. h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
    That's normal. As long as everything is under it's normal operating temperature range. increase fan speed will only suck more dust into your iMac. That's actually not a good idea, and will decrease your Mac's cooling performance in long term.

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