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27" iMac runs very hot?

17583 Views 12 Replies Latest reply: Dec 22, 2010 8:41 PM by TyeJo RSS
Antony D\'Emanuele Calculating status...
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Mar 14, 2010 11:20 AM
My new 27" (2.8GHz i7) is very hot to the touch (top of the machine) and DVDs are very warm even if they have only been in the machine a few minutes. Is this normal?

I have a shelf above my iMac (5cm clearance) and the area underneath is quite warm, I assume that this is enough clearance?

Tony
Mac OS X (10.5.7), G4, G5 Towers, G3, G4 and Intel PBs, Time Capsule, Apple TV, iPhone and iPods.
  • inandoutofgrace Level 3 Level 3 (520 points)
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    Mar 14, 2010 12:01 PM (in response to Antony D\'Emanuele)
    Here are my 27" i7 stats for comparison (temps in Fahrenheit), taken from iStat Pro:

    Optical drive fan: 998 rpm
    Hard drive fan: 1099
    CPU fan: 940
    HD: 103 degrees
    CPU: 92
    Ambient: 65
    GPU Diode: 117
    GPU Heatsink: 113
    Mem Controller: 99
    Optical Drive: 92
    Power Supply 2: 112

    Under most conditions, those are typical readings for my machine. When doing video encoding, on the other hand, the CPU has reached 155 F, the power supply goes to 140 or 150, and all three fans spin at >1200 rpm. Things go back to normal pretty quickly, though, once the encoding ends.

    Also, you might want to consider giving your machine more airspace above it. Good airflow is important for efficient cooling, especially with the key role the top case slot plays in temperature control.
    iMac i7, Mac OS X (10.6.2), 512, SE, PB 100, PB 145, 7100, beige G3, G4 igloo
  • jayboogie Calculating status...
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    Mar 15, 2010 12:05 PM (in response to Antony D\'Emanuele)
    I just got my iMac a few days ago and I am having the same issue. Gets very and on iStat pro my temps seem considerably higher than what you had written.


    HD 112
    CPU 142
    Heatsink 137
    Mem Controller 124
    Opt drive 106
    Power supply 157

    Can that be an issue?
    PowerMac G5, Mac OS X (10.5.5)
  • Dah•veed Level 7 Level 7 (29,555 points)
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    Mar 15, 2010 4:40 PM (in response to jayboogie)
    But what is your iMac doing when it reaches these temps. Surely this is not idling or just surfing the web.

    Dah•veed
    2.0 GHz Early '09 Mac mini - 2GB RAM - 250GB miniStack v3, Mac OS X (10.6.2), Magic Mouse + BetterTouchTool - Happily using Macs since 1984!
  • graphico Level 1 Level 1 (10 points)
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    Mar 15, 2010 6:24 PM (in response to Antony D\'Emanuele)
    What is your room temp? Mine is always warm to the touch. I hear my fan come on when the room temp reaches 80 fI like my room at 82 degrees, but I know its not computer friendly.
    Intel base 27 in iMac, Mac OS X (10.6.2)
  • Misha35 Level 1 Level 1 (50 points)
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    Jun 5, 2010 4:27 AM (in response to Antony D\'Emanuele)
    You may want to try 'smcFanControl' (Google it) and increase the fan speeds a bit. There are set too low by default, IMO.
    Intel iMac 3.06GHz, Mac OS X (10.6.3), 21"/4GB RAM
  • rpusk517 Calculating status...
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    Jul 19, 2010 10:55 PM (in response to Antony D\'Emanuele)
    Not sure if the hard drive type has anything to do with this issue you are having but I got off the phone with Applecare today because I am having a fan issue with my system as well...

    iMac 27", i7, 2TB HD. iStats reports optical and system fans to spin at 1000 rpms. My hard drive fan runs at 4000 rpms after the machine boots up and has been running for 15 min or so. The initial rpm on start up is only 2000 but will gradually increase to 4000 rpms in that 15 min time frame. This is just idling the machine, no other programs running. Room temp is warmer than normal, around 80 but it doesn't seem like that should cause the HD fan only to run that fast. 4000 rpms is too loud for me to tolerate on this machine so I am not sure what to do.

    Applecare suggested I take it to the Apple store to have a technician look at it but for some reason I cannot get anyone to tell me what the default rpms are on the 2TB hard drive? Anyone? I did a proper reset of the SMC and that didn't correct the issue. I guess I will relocate the iMac to a much cooler room (70 degree) to see if there is any difference. The thought of lugging this thing into that Apple Store at the mall isn't what I am looking forward to. Any help or suggestions would be appreciated.

    TIA
    iMac 27", Mac OS X (10.6.4), i7 Quad, 16GB, 2TB
  • WZZZ Level 6 Level 6 (11,880 points)
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    Jul 20, 2010 4:35 AM (in response to rpusk517)
    I cannot get anyone to tell me what the default rpms are on the 2TB hard drive?


    Should be 1100 or close to that for the HDD, certainly not 2-4K. I'd definitely have it looked at. Could be the sensor is bad. (If you want to go further here, it would be better to start your own topic.)
    iMac G3/400 OSX 10.4.11, iMac 21.5" OSX 10.6.4
  • pierrescool33 Calculating status...
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    Sep 27, 2010 12:28 PM (in response to Antony D\'Emanuele)
    my iMac get very warm too. I just use is to surf the web mainly and it will reach temperatures up to 54 degrees celcius (CPU A Heatsink) and also my screen gets warm not very hot but very warm. its a brand new 2010 iMac 21.5". it sits on a disk with nothing around it or covering the vent on the back but my wall. it hasnt shut off but the back and top get extremely hot. when my mac is asleep it also stays warm sometimes and when I resume i see temperatures range from 37-45 at times. the CPU A Heatsink stays around 47 degrees clecius majority of the time. Should I be worried??
    iMac 21.5" (2010 Model), iOS 4, 2010 Model
  • WZZZ Level 6 Level 6 (11,880 points)
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    Sep 27, 2010 1:20 PM (in response to pierrescool33)
    No, don't be worried. Those are OK. Expect the case at the rear upper left to get quite hot as well. The case is used as a kind of heat sink. The old plastic models (G5s) got just as hot, but the plastic didn't conduct the heat very well, so those didn't feel so hot. The thermal shutdown on the older models was, I believe, 85 C, but I wouldn't want to let it get anywhere that close. Don't know what temp causes a shutdown on these, though. This isn't based on anything factual, more a ballpark: I'd start worrying if the CPU gets up around 70C+ At the same time, low 40s to low 50s is nicer. Just surfing for about a half hour, my CPU is only 31C and the Drive is 43C.

    I also run a small, cheap clip on fan aimed at the hottest part of the back.

    See

    http://discussions.apple.com/message.jspa?messageID=12340468#12340468

    Message was edited by: WZZZ
    iMac G3/400 OSX 10.4.11, iMac 21.5" OSX 10.6.4
  • super_monty Level 1 Level 1 (10 points)
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    Sep 27, 2010 12:52 PM (in response to pierrescool33)
    I am not worrying about the temperature too much the top and back does get hot by the vent. But this shows that the aluminum is an excellent conductor and doing it's job and letting the heat escape via the casing and vent.
    27" IMAC I5, Mac OS X (10.6.4)
  • TyeJo Calculating status...
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    Dec 22, 2010 8:41 PM (in response to Antony D\'Emanuele)
    Same problem and could not get smcfancontrol to work but just downloaded imacfancontrol1.2 and fan immediately stepped up when loaded from 980 rpm to over 1200 and temp started dropping. Interesting that as soon as the install completed I could hear the fan noise that I have never heard before.

    Good Luck
    Imac i7, 8gig, Mac OS X (10.6.5)

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