iMac running hot

Discussion in 'iMac' started by TheRaptor, Jul 25, 2011.

  1. TheRaptor macrumors newbie

    Joined:
    Jun 30, 2011
    #1
    Hi,
    I bought a new iMac 21.5 inch (running Snow Leopard), and it is always running hot. The top of the machine is really hot. I have SMC fan control and the temp hovers between 129-133 degrees fahrenheit. Is this normal?
     
  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2
    Normal. The aluminium back is there to cool down the machine, does it takes the heat and radiates it.
     
  3. TMRaven macrumors 68020

    TMRaven

    Joined:
    Nov 5, 2009
    #3
    For which component? 56c is cool for both the cpu and gpu, but running on the hotter end for the hdd. Don't worry about the hdd unless it's always above 60c.
     
  4. TheRaptor thread starter macrumors newbie

    Joined:
    Jun 30, 2011
    #4
    It doesn't tell me. It just says 127F degrees. Its running 1290rpm for cpu and hdd is running at 1800 rpm, odd is 998.
     
  5. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
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    #5
    Then use iStat Pro to monitor the HDD temp, but SMC Fan Control monitors the CPU, thus that temp is perfectly normal.
     
  6. TheRaptor thread starter macrumors newbie

    Joined:
    Jun 30, 2011
    #6
    My HD is 57C degrees.... so all this is normal? At what point does it become not normal?
     
  7. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #7
    105°C for the CPU, maybe even more, but don't worry, the iMac will shutdown before it overheats, which your Mac currently doesn't, it just gets hot.
     
  8. Spike88, Jul 25, 2011
    Last edited: Jul 25, 2011

    Spike88 macrumors 6502a

    Joined:
    Jan 25, 2010
    #8
    HDD should be "consistently" between 30 - 55c. Above 55C and its starting to over cook its insides. Remember that heat = cooks = bad thing.

    I don't understand why the newer iMacs are running hotter and hotter - compared to previous iMacs. Is it because "too much" stuff being packaged into a thin box? Is it because one's ambient temp is hotter then others? Or, it is because applications are doing "more and more" in the background - which is creating more internal heat? Or, is it because Loin and Flash don't like each other - which works the internal items harder (which creates more heat)? Perhaps all these reasons....

    I don't believe in driving anything (car or computer) until it automatically shuts down. It would be like driving a vehicle until its reactive "too late" dash light comes on. "Too late" light because when it does come on (or when the iMac auto shuts down from heat over load), the internal damage is already done. If the iMac inside's feel hot, looks hot and smells hot, then guess what, its insides is hot. Ya, one of those "duck" things.

    Here's the specs of my 21.5" iMac. re:
    http://i178.photobucket.com/albums/w251/Spike99-Pictures/New iMac system/InternalTemps2010-08-30.png
    http://i178.photobucket.com/albums/w251/Spike99-Pictures/New iMac system/FanSpeedJune25-2011.png

    Notice its insides isn't hot (HDD is nice 43C - between 35 - 55 range) and its other temps are within cool range as well. All because I've tweaked its factory fan speeds and discovered what works best - for my iMac's usage. Yes. Sampling and "tweaking" its settings every over day for 4 weeks does allow its most optimal "cooling to fan RPM" best configuration truth float to to surface.

    As a minimum, do purchase a small silent sound fan and install behind the iMac chassis. Something with physical speed control switch - to allow you to control its air flow. If blowing air against your iMac's back cover lowers its insides even a small 5C degrees, its well worth it. Especially if ambient temp in your computer room is higher then average as well...

    Always remember that "heat = bad". Cool = good. And, cool = long term usage without breaking down and/or randomly hanging (from over cooked insides). Apply proactive cooling improvements and your iMac's insides will thank you... Just like your automobile likes to keep cool. And, your human body likes to keep cool as well....

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