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  1. #1
    20" Aluminum iMac Overheating?

    Member Since
    Nov 19, 2007
    Posts
    1
    20" Aluminum iMac Overheating?
    Hey guys, Im wondering a few things...
    Im a multi-media student, I bought a new iMac (specs below), Im running everything from after effects, photoshop and cinema 4d to logic pro8 and reason... Lots of stuff, But im wondering if anyone has had any heating issues. Right now it says my computer is running anywhere from 50 to 75 celcius, Im really wanting this computer to last and Im wondering if anyone has any good ideas or knows of any good products that will lower my temperature by like 10 degrees??

    Right now I just have a little fan sitting behind it but I dont think that it's doing too much cooling (other than keeping me cool).


    My specs:

    iMac (20')
    Core 2 duo 2.4 ghz
    2 GB ram (667)
    Radeon 256 graphics card
    300 GB hard drive

    My software:

    Cinema 4D
    Creative suite CS3
    Logic pro 8
    Reason 3.0


    THANKS!

  2. #2
    20" Aluminum iMac Overheating?
    Montie Da Champ's Avatar
    Member Since
    Nov 18, 2007
    Posts
    234
    The problem i see is that you probably don't have enough ram to run these programs. They are highly memory intensive. You shoudl probably move your computer to a more well ventilated area, or upgrade your ram.

    When my computer runs hot i usually just shut it down, put a fan on it for a while, and then come back 5 minutes later and resume from a fresh start up.

    (thats w/ a windows pc though) i'm not getting a mac for a few weeks.

  3. #3
    20" Aluminum iMac Overheating?
    bennjiboi's Avatar
    Member Since
    Jun 16, 2007
    Location
    Sydney, Bondi
    Posts
    442
    Specs:
    iMac 27" 3.06Ghz 4G Ram| iPhone 3G 8Gb
    You could always try a fan control program like smcFanControl.

    It gives you the choice to change the fan speed so when you think it's running a little hotter then you would like simply turn up the fan and wa-la.

    That's what i tend to do anyway.. but i'll admit i don't run the programs you do..

    Ram would help performance but I cant say it will help the heat.
    Stanton ATM 6 active monitors | Canon 450D | Razer Sphex

  4. #4
    20" Aluminum iMac Overheating?
    D3v1L80Y's Avatar
    Member Since
    Feb 02, 2004
    Location
    PA
    Posts
    12,456
    Specs:
    MacBook
    It isn't overheating. If it had overheated, it would have shut down automatically as a protective measure.
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  5. #5
    20" Aluminum iMac Overheating?

    Member Since
    Jan 27, 2007
    Location
    *Brisvegas*
    Posts
    5,658
    Specs:
    17 inch 2 GHz C2D imac (5,1) with 3GB DDR2 RAM, X1600 (128MB memory) GPU - OSX 10.6.3
    At what temperatures does a mac thinking about shutting itself down as a precautionary measure?

  6. #6
    20" Aluminum iMac Overheating?
    bennjiboi's Avatar
    Member Since
    Jun 16, 2007
    Location
    Sydney, Bondi
    Posts
    442
    Specs:
    iMac 27" 3.06Ghz 4G Ram| iPhone 3G 8Gb
    lol I'd love to know too..

    Or at what temp if it doesn't decide to shut it's self down should you shut it down..

    I personally don't let my MacBook run much over 55C
    Stanton ATM 6 active monitors | Canon 450D | Razer Sphex

  7. #7
    20" Aluminum iMac Overheating?
    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,206
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '11 1.8 i7 4GB 10.10; 21" iMac '13 2.9 i5 8GB 10.10; 5s & 5c
    Quote Originally Posted by D3v1L80Y View Post
    It isn't overheating. If it had overheated, it would have shut down automatically as a protective measure.
    Ditto.....

    If you're going to use your computer for highly intensive CPU or GPU tasks it is going to heat up. A lot of encoding and 3d intensive games are both going to take the temps to the 70C mark.

    Am not going to go check now, but according to my now getting senile mind, the shut off temp was something around 85C the last time I went looking for it.

    Have used my MBP for hours at a time (6-10 hrs) on too many occasions to count running at 70 - 72C.

    All of this temp thing comes from the windows side and all of the folks trying to overclock their CPU's (and I are one) and trying to get a stable speed from a processor that you're pushing to the limit. For the rest of you just using your computer at the speeds it was designed for - quit worrying, be happy.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  8. #8
    20" Aluminum iMac Overheating?

    Member Since
    Oct 28, 2007
    Posts
    136
    Specs:
    24" iMac, 2.4GHz C2D, 4 GB RAM, 320 GB hard drive, OS X 10.5.1
    Like the others have stated. It was made to run at those temps. If it gets too hot, it will shut itself down. 75C is safe.

  9. #9
    20" Aluminum iMac Overheating?

    Member Since
    Oct 25, 2007
    Posts
    18
    I have a 24" Aluminum and it goes to 70C

  10. #10
    20" Aluminum iMac Overheating?
    Alexis's Avatar
    Member Since
    Apr 20, 2006
    Posts
    2,255
    Specs:
    Al iMac 20" 2.4Ghz Intel Core 2 Duo
    At what temperatures does a mac thinking about shutting itself down as a precautionary measure?
    Nobody can get it to shut down at the critical temperature because it's impossible to get near it, because it's designed not to overheat!!

    Like PC BIOS's, the EFI probably has 85C or so at a shutdown temperature.

  11. #11
    20" Aluminum iMac Overheating?

    Member Since
    Jun 28, 2008
    Posts
    2
    Hi.

    I bought a refurbished iMac which ran extremely hot on the top left and the top left back. I returned it to Apple, and received a replacement. This is the last version of the aluminum iMac just before the ones currently shipping.

    2.4 GHz C2Duo, 1 GB RAM, 320 HD, Radeon 2500 Pro Graphics

    My second machine still gets quite hot just using it for web surfing and instant messaging, and nothing else.

    Here are the operating temperatures of the machine according to iStat Pro:

    Sitting idle:

    HD - 50C
    CPU A - 38C
    GPU - 49C
    GPU Diode - 52C
    GPU Heatsink - 49C
    Ambient - 25C
    Memory Controller - 41C

    The next set of temperaatures is just for having Firefox open and surfing the web, and an instant messenger program, used sparingly, both which barely use the CPU, and only use the HD for cache reading/writing.... certainly not the processor and HD intensive work of ripping a movie, or using a graphics intensive program)

    HD - 52C
    CPU - 46C
    GPU - 60C
    GPU Diode - 64C
    GPU Heatsink - 59C
    Ambient - 28C
    Memory Controller - 47C

    ----------

    If these temperatures are within spec for such non-CPU and HD intensive work, then why does the top left of the iMac get so hot?

    Also, I downloaded smcFanControl and upped the CPU and HD fan from 1200 to just over 1400 RPM, and it seems to be helping the temperatures a bit, but the top left of the computer still seems to be as hot.

    Is keeping the fans running faster detrimental to the machine? Will they wear out sooner?

    Should I worry about the heat on the top left, or does everyone else's iMac get that hot?

    Thanks in advance!

    Greg

  12. #12
    20" Aluminum iMac Overheating?

    Member Since
    Feb 12, 2008
    Posts
    26
    Well, I personally don't know a lot about temperatures, but I've read many times that decreasing a CPUs temperature by 10 degrees Celcius, you are extending its lifespan by about 100% (i.e. if you used it ALL THE TIME at 70ºC it would last 20 years, whereas if the regular temperature was 60º it'd last 40). So, if you're interested in getting the thing to work for 10-15 years instead of 6-12, (assuming NOTHING ELSE fails) yeah, use smcFanControl like some of us do.

  13. #13
    20" Aluminum iMac Overheating?
    Alexis's Avatar
    Member Since
    Apr 20, 2006
    Posts
    2,255
    Specs:
    Al iMac 20" 2.4Ghz Intel Core 2 Duo
    If these temperatures are within spec for such non-CPU and HD intensive work, then why does the top left of the iMac get so hot?

    Also, I downloaded smcFanControl and upped the CPU and HD fan from 1200 to just over 1400 RPM, and it seems to be helping the temperatures a bit, but the top left of the computer still seems to be as hot.
    The case is meant to get hot. It's disappating the heat, otherwise it would remain inside the machine. Worrying that the case is hot is like worrying that your car engine is hot to the touch.

    The fans are designed to spin around! Sorry to bring in another car analogy, but worrying about the fans is like worrying that your windscreen wipers won't last if you live in a wet climate!

  14. #14
    20" Aluminum iMac Overheating?

    Member Since
    Jun 28, 2008
    Posts
    2
    Thanks! The iMac is running just fine with the temps recorded above.

    Yes, the heat is dissipating where it should be, and the fans are working just like wiper blades, so all is good!


  15. #15
    20" Aluminum iMac Overheating?
    Alexis's Avatar
    Member Since
    Apr 20, 2006
    Posts
    2,255
    Specs:
    Al iMac 20" 2.4Ghz Intel Core 2 Duo
    I'm playing Crysis on Windows XP and the top of the case gets so hot you can't hold your hand there for more than a couple of seconds.

    It's as happy as larry though!

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