2.8 imac heat issues

Discussion in 'iMac' started by ppolios, Jan 10, 2008.

  1. ppolios macrumors newbie

    Joined:
    Jan 10, 2008
    #1
    Hi all, I'm new here and was hoping for some feedback. I got a new 2.8 iMac and had it replaced after the Power Supply Position was idling at 82 degrees Celsius, and the top of the case felt very hot to the touch. The fans never "kicked in" even though it was that hot.

    Anyways, I got a replacement machine and the Power Supply Position now idles at about 68-70 degrees Celsius (much cooler), but the external portion of the machine still feels extremely hot.

    So my question is, how hot is too hot?? Is my machine normal and am I worried about nothing?? Should I be using SMC Fan Control?? Is the heat because of the 2.8 processor??

    Thanks in advance,

    -Paul
     
  2. Caris macrumors 6502a

    Caris

    Joined:
    Sep 25, 2006
    Location:
    Newcastle Upon Tyne, UK
    #2
    I use the iStat pro widget, it gives you readings of there.

    As long as the CPU isn't idling anymore than 50 and the GPU at 60 you should be fine.
     
  3. kilo67 macrumors newbie

    Joined:
    Nov 24, 2007
    #3
    Dumb question!

    Just got an iMac after many years in the PC world.
    Where do I go to view my operating temps?

    iMac 2.8
     
  4. ppolios thread starter macrumors newbie

    Joined:
    Jan 10, 2008
    #4
    download the istat widget or hardware monitor
    Let me know where your Power Supply Position is at after being on for an hour.


    -Paul
     
  5. ArtTechFreak macrumors newbie

    Joined:
    Dec 30, 2007
    Location:
    Just East of San Frandisco
    #5
    Greetings,

    If I'm not mistaken the Aluminum iMacs are made from a single piece of stamped aluminum. Thus, the back of the iMac feels really hot because aluminum is a very good conductor of heat. Aluminum is a very common material in heatsinks for electronics as well as in cookware because it transfers heat so well. So don't fret too much if the back of your iMac feels hot;the aluminum is just doing its job!

    As long as the internal temps in the iMac are within the proper range there is nothing to worry about.

    R
     
  6. davekarn macrumors 6502

    Joined:
    Jul 27, 2007
    #6
    I experienced a lot of heat when I first got my 2.8, but ever since Leopard and the various updates, it's been significantly cooler.

    ~Dave
     
  7. Leon Kowalski macrumors 6502a

    Leon Kowalski

    Joined:
    Sep 20, 2007
    Location:
    Gondwanaland Reunification Front HQ
    #7
    I believe the hard drive is the component most at risk from excessively
    high temperatures. Almost all iMac factory-installed HDs are spec'd for
    a maximum ambient operating temperature of 55C or 60C.

    If iStat or Temperature Monitor show over 45C as the normal "idle state"
    temperature in "Drive Bay #1", it's reason for concern. There's no reason
    for the HD's idle temperature to be above 35C or 40C.

    LK
     
  8. AlexisV macrumors 68000

    AlexisV

    Joined:
    Mar 12, 2007
    Location:
    Manchester, UK
    #8
    We get a new thread like this every other day.

    The iMac feels hot at the back, on the left. The aluminium case acts as a giant heatsink. If the heat is on the outside, there's less on the inside.

    We know of no incidents where an iMac has failed from heat issues.

    True, in theory. But I don't think we've seen anyone with idle HD temps in the 50's.

    All this worry is conjencture, and a lot of it seems to be due to the impression that Apple have somehow designed the iMac 'wrongly'.
     
  9. Tonerl Guest

    #9
    My 24", 2.8 iMac's temperatures are reported by iStat as:
    CPU 38, GPU 49, HDD 51 (all in Celsius). It feels warm along the top and at the back but is working OK.
     
  10. Caris macrumors 6502a

    Caris

    Joined:
    Sep 25, 2006
    Location:
    Newcastle Upon Tyne, UK
    #10
    That can't be true, i have had 3 iMac's over the past week due to dead pixels and in each one the HDD has been low to high 40's. That's in the middle of winter and my Mac has nothing around it blocking airflow.

    Readings from iStat pro.
     
  11. eRondeau macrumors 6502a

    eRondeau

    Joined:
    Mar 3, 2004
    Location:
    Canada's South Coast
    #11
    I've never worried about my 2.8 iMac because it's never felt anything more than a little warm. Definitely never been "hot". I never hear the fan start either. Are you sure you removed all the packing plastic from around the air vents? Do you run at max brightness all the time? (I keep mine at minimum.)

    Here's my temp stats -- been running continuously for weeks, woke from sleep about an hour ago...
     

    Attached Files:

  12. bluedoggiant macrumors 68030

    bluedoggiant

    Joined:
    Jul 13, 2007
    Location:
    MD & ATL,GA
    #12
    wow, some cool imacs on here, my temps are in farenheit, and no, those arent my highest, ive had the GPU diode up at 152, while i was playing doom 3, nothing intensive, and the airport card up at 149

    I've practically burned my hands on this machine, its insanely hot, from what i can feel, the upper left side is VERY HOT, also on top of the HD, the power board is also hot, and something else in the upper right corner, and no, it isnt the optical drive, what do you think of these temps?
     

    Attached Files:

  13. ppolios thread starter macrumors newbie

    Joined:
    Jan 10, 2008
    #13
    Everything else seems to be running ok but my hard drive does idle at 50 degrees Celsius. I have the Hitachi 750 gb drive. I heard those run hotter but should I be concerned??

    Thanks,

    -Paul
     
  14. Dimwhit macrumors 68000

    Dimwhit

    Joined:
    Apr 10, 2007
    #14
    My hard drive is at about 57 degrees. CUP is at 49 degrees. Power supply at 69 degrees. For the most part, I seem to be on the high end of things.

    But, the computer is quiet and works just fine. My hard drive is backed up to an external drive. If something happens, I have AppleCare. But I'm not really worried. I would think that if things got excessively hot, I'd be hearing fans revving up quite a bit. But the CPU fans is at 1200rpm, the hard drive fan at 1300rpm, and the optical fan at 700rpm.
     
  15. bluedoggiant macrumors 68030

    bluedoggiant

    Joined:
    Jul 13, 2007
    Location:
    MD & ATL,GA
    #15
    Your cup is 49 degrees?? celcious? wow, that must be a a reasonable temperature for drinking coffee lol:rolleyes:

    i think you mean cpu:p
     
  16. Dimwhit macrumors 68000

    Dimwhit

    Joined:
    Apr 10, 2007
    #16
    Heh. I'm the master of typos...

    Though maybe it's just the cup I wear when playing football. No more kids for me...
     
  17. AlexisV macrumors 68000

    AlexisV

    Joined:
    Mar 12, 2007
    Location:
    Manchester, UK
    #17
    FINE.

    NO.
     
  18. Leon Kowalski macrumors 6502a

    Leon Kowalski

    Joined:
    Sep 20, 2007
    Location:
    Gondwanaland Reunification Front HQ
    #18
    Seagate, WD, and Hitachi all specify 55C or 60C maximum (depending on
    model). An anonymous voice on The Internets says "don't worry" ...

    ...believe what you like, it's your drive,

    LK
     
  19. Leon Kowalski macrumors 6502a

    Leon Kowalski

    Joined:
    Sep 20, 2007
    Location:
    Gondwanaland Reunification Front HQ
    #19
    If it's "insanely hot" on the outside, it's even hotter on the inside, as
    your iStat Pro readout clearly indicates. I'd suggest smcFanControl
    to try to get that HD temperature down into the "sane" range.

    LK

    Heat won't pass from a cooler to a hotter
    You can try it if you like, but you'd far better not-a
    'Cos the cold in the cooler will get hotter as a rule-a
    'Cos the hotter body's heat will pass to the cooler

    -- Flanders & Swann (The First and Second Law)

    .
     
  20. bluedoggiant macrumors 68030

    bluedoggiant

    Joined:
    Jul 13, 2007
    Location:
    MD & ATL,GA
    #20
    uhhm, did you bother seeing the attachment?
     
  21. bbarnhart macrumors 6502a

    bbarnhart

    Joined:
    Jan 16, 2002
    Location:
    Stilwell, Kansas
    #21
    The iStat widget... the fan speed panel... I'm pretty sure none of my fans are spinning. I took another moment to listen very carefully. I can hear some fanish noise, but I think it's the HD. Is that fan speed accurate?
     
  22. ppolios thread starter macrumors newbie

    Joined:
    Jan 10, 2008
    #22
    Unfortunately even using SMC Fan Control at 2500 on the HD, it is still idling at 47 degrees Celsius. Should I have the computer replaced?? Or is this acceptable??

    Thanks,

    -Paul
     
  23. nickf macrumors member

    Joined:
    Oct 2, 2007
    #23
    Actually, that's only a description of the First Law of Thermodynamics :)

    Regarding the temperatures posted here - don't worry about them. I think Apple's engineers know more than we do about such things.
     
  24. Leon Kowalski macrumors 6502a

    Leon Kowalski

    Joined:
    Sep 20, 2007
    Location:
    Gondwanaland Reunification Front HQ
    #24
    Actually, that was only part of he lyrics.

    I ain't worried -- my drive's running at 38C,

    LK
     
  25. AlexisV macrumors 68000

    AlexisV

    Joined:
    Mar 12, 2007
    Location:
    Manchester, UK
    #25
    Better go tell Apple that every iMac is likely to burst into flames at any moment then. Can't believe the fools went ahead and built such a silly design without consulting Seagate or WD.

    I don't know. What are they like eh?
     

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