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  1. #1

    Member Since
    Jan 26, 2011
    iMac 27" core i7
    Hi, I am new to this forum thing.

    I have a 27" iMac core i7 and the secondary heat sync get to 194 degrees Fahrenheit it smells hot. I don't know if that is normal? what is a safe temperature?

  2. #2

    chas_m's Avatar
    Member Since
    Jan 22, 2010
    Victoria, BC
    Mid-2012 MBP (16GB, 1TB HD), Monoprice 24-inch second monitor, iPhone 5s 32GB, iPad Air 2 64GB
    Perfectly normal. Apple knows what they are doing.

    Please read this thread.

    Yes, I know it's oriented around portables. But it applies to your machine too.

  3. #3

    Member Since
    Feb 19, 2009
    Congrats on your nice rig. That is normal like chas_m said. You are just "braking it in" like in a new car when the engine gets hot for the first time you drive it. Enjoy that beauty.

    Once you go Mac, you never go back!
    Windows is nothing but a POS!

  4. #4

    Raz0rEdge's Avatar
    Member Since
    Jul 17, 2009
    27" i7 iMac, 24" iMac, 13" Macbook Air, iPhone 5 & 5S, iPod Nano 7th Gen, iPad 2 16GB WiFi, iPad 3
    That's 90C and very close to the top temperature of the CPU. But if the heatsink is picking up that much temp, the CPU or whatever component is connected to the heatsink is even more higher and that's definitely not good..

    There is no "breaking in" period with computers like cars. These are not mechanical things that need to have groves and so please don't confuse the issue..

    How are you checking the system temps? Grab the free iStat nano, a Dashboard Widget by iSlayer and install it. Now open up the Dashboard and enable the iStat Nano widget if it isn't visible and take a peek at the temps.

    On my 27" i7 iMac, I get the following numbers:

    HD: 36C
    CPU: 32C
    Ambient: 14C (crazy cold basement)
    GPU Diode: 46C
    GPU Heatsink: 43C
    Mem Controller: 35C
    Optical Drive: 30C
    Power Supply 2: 45C

    Under crazy load, I've had the CPU go to about 60-65C..but that's about it..


  5. #5

    IvanLasston's Avatar
    Member Since
    Feb 26, 2010
    Rocky Mountain High, Colorado
    1.8 GHz i7 MBA 11" OSX 10.8.2
    Is this at idle or is it when you are doing something like watching flash movies? If you are doing nothing and the CPU is low utilized - then there is something wrong. Also, at what RPMS are the fans? At 90 deg c I'd expect the fans to be around 4000-5000 RPM.
    You can use smc fan control to see/set the fan speeds.
    Download smcFanControl for Mac - Control Intel Mac fans to make them run cooler.

    See this article
    Intel Core i7 Temperatures | Puget Systems Blog
    Around 100 deg c the CPU will start throttling to help it cool - and as stated before you are around 90 deg c.

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