Max CPU and GPU Temp For rMBP and Best Way To Monitor Temp

Discussion in 'MacBook Pro' started by niblet, Dec 24, 2013.

  1. niblet macrumors newbie

    Dec 24, 2013
    Hi, I have been concerned that my computer is overheating, but it seems that it is operating at a normal temperature. I am however wondering what the max operating temps are for the GPU and CPU, and what is the best way to measure the temperature. I currently use Temperature Monitor, but it seems to be an older version that is not specifically made for my model. Also, when should the fans speed up. My computer has been at around 85 degrees C and the fan was at only 2500 RPM, making my computer uncomfortably warm.
  2. dusk007 macrumors 68040


    Dec 5, 2009
    Todays computers don't overheat ever.
    All chips have sensors. If they get to a certain temp, they start throtteling (clocking down or using less turbo) and if that doesn't help they just shut everything down instantly.

    Heat issues only manifest by having a slow computer that cannot keep high clocks or by a really noisy one. Monitoring temps tells you nothing of worth.

    The CPU will go up to 100C before all it throttles and 105 or 110 is when it shuts down. The GPU has similar heat ceilings but never really reaches them.
  3. GGJstudios macrumors Westmere


    May 16, 2008
    If you're not already doing so, use iStat Pro (free) or iStat Menus ($16) to get accurate readings of your temps, fan speeds, etc., rather than relying on your sense of touch or sound. A forum member has posted a copy of iStat Pro that has been "tweaked" to enhance compatibility with Mountain Lion. You can download it here.
    The Intel processors used in Macs are designed to automatically shut down to prevent damage if they truly overheat. CPU Tjmax = 105C (221F), GPU Tjmax = 100C (212F) on i3, i5, i7 processors. (Source: Intel)
    Unless there is a rare defect in a Mac, most temps are well within the normal operating range, considering the workload being put on it. Websites with Flash content, games and other multimedia apps will put higher demand on the CPU/GPU, generating more heat. This is normal. If you're constantly putting high demands on your system, such as gaming or other multimedia tasks, expect temps to rise and fans to spin up accordingly. It's just your Mac doing its job to maintain temps within the normal range.
    It is also quite normal for your Mac to become extremely hot to the touch during intensive operations. The aluminum body transfers heat more effectively than other materials used in computer casings, so you will feel the heat more. This doesn't indicate that it's overheating and will not harm the computer to be hot to the touch.
    Your fans are always on when your Mac is on, spinning at a minimum of 2000 rpm (for MBPs) or 1800 rpm (for MBAs, MBs and minis), or 1200 for the newest MBAs. Older iMacs have 3 fans with minimum speeds in the 800-1200 range, while the newest iMacs have a single fan, spinning at a minimum of about 1400 rpm. They will spin faster as needed to keep temps at a safe level. If your fans are spinning up without increased heat, try resetting the SMC. (PRAM/NVRAM has nothing to do with these issues, so resetting it will not help.)
    The intake and exhaust vents are in the back of the computer near the hinge on all notebooks in the MacBook line (except the new MBP with retina display, which has intake vents along the sides at the bottom). The iMac vent is a slot on the back near the top of the computer. Make sure the vents remain unblocked to allow your computer to perform at its best. For Flash-related issues:
  4. Doward macrumors 6502a

    Feb 21, 2013
    That's normal. Apple's thermal profile allows the CPU to run up to just under 90C before the fans really start to kick in.

    As long as your system never stabilizes over 95C in temperature, you're running just fine.

    105C is the *maximum* limit that Intel recommends the CPU be run at. If you are consistently hitting 100C+, you have issues.

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