Power Supply temp on iMac 24"

Discussion in 'iMac' started by nikuskwas, Dec 1, 2007.

  1. nikuskwas macrumors newbie

    Sep 26, 2007

    I just bought a new iMac 24" yesterday and installed everything that I normally use, including iStat. I set the temp monitor on the menu bar, and just noticed that after some hours of work, the Temp sensor is reporting a 80 degree temperature on the Power Supply 1. Is this normal? does anyone have this too?


  2. nakile macrumors regular

    Jun 30, 2007
    Seems normal to me. My 20" iMac hasn't even been on for 30 minutes and the PSU temperature is 53C, and climbing.

    I'll post back what it tops out at in a few hours.
  3. vansouza macrumors 68000


    Mar 28, 2006
    West Plains, MO USA Earth
    I am no expert, but

    If that is 80C that seems very high. Get the iSatPro and it will breakdown the temps for you... and download smcFanControl (be sure it is version 2) and think about increasing your fan speeds. I keep the house at 68F this time of year and the average temps are mid 40'sC. I keep the airport card off because I am using a wired net connection and it gets VERY hot.

    If you do a search for your areas of concern you will find plenty to keep you busy reading posts.
  4. nikuskwas thread starter macrumors newbie

    Sep 26, 2007
    Thanks Nakile and Vansouza for your replys,

    Yes 80C seems a lot to me too. I've read somewhere in these forums that normally it should be between 50-70C for all the computer temp. My ambient temp is 26C (78.8 F) so it should not be a major factor for the Power Supply temp. Airport is always off, since I use Ethernet cable. I will look for iStatPro to check this a little further. Concerning the fan speed...I read that increasing their speed shortens their life too... Any other suggestions? perhaps this is a factory defect...?

  5. DesignerOnMac macrumors 6502a


    Jul 23, 2007

    my Power Supply is @ 81C. Are you trying to start yet ANOTHER Thread with factory defects? Not sure if this is a defect or not. Why speculate before you know the facts? Anything on Apples site of hardware temps?
  6. RevToTheRedline macrumors 6502a


    Sep 27, 2007
    I bought my iMac 3 months ago, the first thing I noticed was the extreme heat coming off it, I checked the temps and it was 80-82C Power Supply and 60-62C HDD, being in the computer repair field for over 10 years I was immediately concerned. The problem is that the fans do not run fast enough, and it is unacceptable that Apple has not acknowledged this. What I highly recommend you do is download and run smcFanControl with the fans at about 1500/2500/2000rpm (top to bottom fans). Set it at that, and set it to automatically start when the computer loads, you will never have to worry about it.

    My power supply temp now never goes over 65C (right now 56C), and HD never goes over the low 40's (now 37C). If you don't want your iMac to last over a year you can continue running it at that high of a temp but I know it won't last.

    To further my reason why I think you should definitely run the fans higher, Western Digital and Segates spec on their 3.5" hard drives is "maximum operating temp of 60C" The fact that under stock fan speeds its over that, it concerns me greatly.

  7. nakile macrumors regular

    Jun 30, 2007
    My PSU is now 69C. My iMac is warm to the touch like always, but not burning.

    Edit: It's now dropped down to 61C 59C.
  8. Leon Kowalski macrumors 6502a

    Leon Kowalski

    Sep 20, 2007
    Gondwanaland Reunification Front HQ
    Quite a few HDs are spec'd for 55C max ambient -- including some that I've seen reported
    in iMac BTO upgrades. For example, someone recently reported a Seagate ST3500630NS.
    That's a fantastic drive, optimized for 24/7 high-reliability RAID/NAS service, but 55C max.

  9. nikuskwas thread starter macrumors newbie

    Sep 26, 2007
    Thank you for that very complete and helpful post!

    Yes, as vansouza also suggested, I downloaded smcFanControl and set the fan speeds as you said. There is now a "small noise" of the fans as I write this, so I know it is working. Here are some screens of a 10 minute difference between default-fan-speed and my New-fan-speeds. I guess that it would be better (and cheaper) if the fans got "toasted" instead of some major computer component... What worries me now is that Apple's sleek and elegant design to build computers is starting to interfere with technical aspects of their computers... How is it possible to build a computer so badly ventilated???


    Attached Files:

  10. gorby macrumors 6502

    Oct 20, 2007
    Mine usually hovers around 60 degrees celsius when it gets warmed up.
  11. phytonix macrumors 6502

    Jan 26, 2006
    I am having 24" 1st gen LCD burn in issue.
    My power supply is over 80 celsius degrees. Now I am using this program to cool it down. Now around 56-60 degrees. Hopefully this will solve the burn in problem, as reported by others.:D
  12. gehrbox macrumors 65816


    Jul 5, 2007
    Mine is 63deg C while browsing
  13. GR33NIE macrumors 6502

    Jul 9, 2008
    Mines been on nearly all day so far and is at 60deg ;)
  14. solidgoldmini macrumors regular

    Sep 14, 2004
    In a house. On a street. In a city.
  15. imac123 macrumors regular

    Apr 26, 2008
    mine is usually around 60-70 deg C with smcfancontrol running at slightly bumped up fan speeds
    if it's warm or I'm running alot of stuff it can get around 75 deg C
  16. RValverde86 macrumors newbie

    Jul 26, 2009
    How do these temperatures look

    This is how hot mine gets after being on for a while. I'm worried my computer will get messed up, I've noticed the processor has been running at a higher percentage than usual (menu meters) for doing regular tasks.

    Any recommended fan speeds for smc or any other advice?

    Attached Files:

  17. zmttoxics macrumors 65816


    May 20, 2008
    Mine are always low. My 20" might be a fluke, but its coldest Mac I have ever owned. These are in celsius btw...

    Attached Files:

  18. paulbeattie87 macrumors regular

    Aug 17, 2008
    North East Scotland
    This new 24" 2009 iMac seems to sit at 60c on the PSU

    On my old 2008 model it would get as high as 86c :eek:, the HDD was heading towards 70c. It wasn't good. The fan speed just never changed always sitting at the same speed regardless of the inside temperatures.

    All the heat caused LCD burn in issues, my SuperDrive to stop working. Sent off to the repair shop, they couldn't fix it. I now have a replacement iMac from Apple because of it. Not good, they really should have the fans increasing in speed as temps rise. Off to bed anyway, going to monitor temps when the iMac has been left on with screen off in morning.
  19. Hellhammer Moderator


    Staff Member

    Dec 10, 2008
    CPUs used in 2008 models were 55W and 2009 models have 44W and 35W. It can be one of the reasons
  20. AlexisV macrumors 68000


    Mar 12, 2007
    Manchester, UK
    Apple ships all its iMacs with dangerous overheating defects.

    You need to install iStat as soon as possible or else it could burst into flames at any moment.

    The only reason they don't tell you is because they want your machine to melt so they can sell you another one.
  21. GregGebhardt macrumors 6502

    Feb 5, 2010
    Good grief! My first iMac will be here on Wednesday. After reading this, I am bringing the hose in the bedroom window while installing my software, just in case!:eek:

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