Maximum Tempaerature Query

Discussion in 'Mac Pro' started by G99, Mar 17, 2006.

  1. G99 macrumors 6502


    Mar 8, 2006
    I was wondering, what is the maximum temperature the CPU will go, before damaging itself on an iMac G5? I've recently seen some really high temperatures, like 71C, for the CPU.
    Thanks in advance.
  2. Jaffa Cake macrumors Core

    Jaffa Cake

    Aug 1, 2004
    The City of Culture, Englandshire
    I'm not sure exactly how high it can go, but the temperature sensors are designed to shut down the Mac before it gets hot enough to do any damage to the internal components.
  3. howesey macrumors 6502a

    Dec 3, 2005
    Anything above 60C willl cause instability. That's a bit hot, I'm running at 45C here on my iMac.
  4. calebjohnston macrumors 68000


    Jan 24, 2006
    That temperature sounds like something you'd get running a heavy program and music and internet simultaneously. Is that the case? ( to the OP )
  5. thomasp macrumors 6502a

    Sep 18, 2004
    Currently, my 15" 1.5GHz PB is running at 56C (processor bottomside), and I've only got Safari and Mail open... I had X-Plane on earlier, and it peaked at around 62C. The Processor/Controller Bottomside is one degree more at both times.

    According to Temperature Monitor, the maximum limit of the processor bottomside and processor/controller bottomside is 75C and 76C respectively.

    Also, I don't get any instabilities running at over 60C - I just get a very, very warm desk! The desk feels warm if I put my hand on the underneath!! :eek:
  6. G99 thread starter macrumors 6502


    Mar 8, 2006
    Right now, with just Safari open, I'm running at 68C.
    Strange, because this iMac is 6 months old.
    But, I've got CPU performance as "Highest"
  7. mmmcheese macrumors 6502a


    Feb 17, 2006
    Time get some bottled air and clean out the dust...
  8. mrichmon macrumors 6502a

    Jun 17, 2003
    There is no fixed temperature above which CPUs become unstable. It all depends on the individual chip itself. CPU temps up to about 75-80C are well within tolerances as a general rule.

    An iMac consistently running at 68C when only using Safari and not hitting any sites using CPU intensive things like flash and/or applets might be a little warm. However, it all depends on the room temperature and your actual system load.

    It is probably worth checking that your iMac is getting sufficient ventilation. That is, nothing blocking the intakes at the bottom, or the outlet slot at the rear, top of the iMac. If you have the heat on or other heat producing things near the iMac, that the hot air is not blowing onto the iMac. The iMac is not in an enclosed space such as a wall unit or tall shelf/desk construction. Etc.
  9. calebjohnston macrumors 68000


    Jan 24, 2006
    As someone said (I've never owned an iMac), if there's room for you to use compressed air or (or a vacuum on a lower setting believe it or not), I would do it. A few seconds with a vacuum sucked up a good handful of dust out of my old PC - and got it working again too.
  10. EricNau Moderator emeritus


    Apr 27, 2005
    San Francisco, CA
    My iMac G5 is always at maximum load (because I'm a MacRumors Folder), and my temp is always about 71 degrees C. No instability here.

    Above 80 degrees C is when you have to worry.

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