Weird Temp Reading

Discussion in 'MacBook Air' started by Mrbobb, Oct 11, 2012.

  1. Mrbobb macrumors 601

    Joined:
    Aug 27, 2012
    #1
    2011 Air, 10.8.2

    So am surfing merrily, just reading news, not playing video, and Istat says my cpu is at 76c, fan is at 2K, WTF? I look at the cpu load gauge and it's essentially flat. I can feel the warm from under.

    The only way to fix is to reboot, then the temp goes back down to a more normal 40c+

    OSX is so weird, what the #&%^ it's doing in there?
     
  2. wolfpuppies3 macrumors 6502

    Joined:
    Jun 26, 2012
    Location:
    Virginia, USA
    #2
    My CPU temp is routinely 60 + degrees C. Normal.
     
  3. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #3
    Follow every step of the following instructions precisely. Do not skip any steps.
    1. Launch Activity Monitor
    2. Change "My Processes" at the top to "All Processes"
    3. Click on the "% CPU" column heading once or twice, so the arrow points downward (highest values on top).
      (If that column isn't visible, right-click on the column headings and check it, NOT "CPU Time")
    4. Click on the System Memory tab at the bottom.
    5. Take a screen shot of the entire Activity Monitor window, then scroll down to see the rest of the list, take another screen shot
    6. Post your screenshots.

    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)

    If you're not already using it, iStat Pro (free) or iStat Menus ($16) will give you accurate readings of your temps and fan speeds, among other things.

    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). iMacs have 3 fans with minimum speeds in the 800-1200 range. 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 Mac notebooks (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.

    Learn about the fans in your Mac
    Apple Portables: Operating temperature

    For Flash-related issues:
     
  4. Mrbobb thread starter macrumors 601

    Joined:
    Aug 27, 2012
    #4
    Well slap me silly.

    So the gauges only show partial information until I tell it to show me all? OSX compartmentalizes the heat generated by system processes separate from users processes?

    Wacky, wacky OSX.

    Am sure is a background task doing all the hubba behind my back.
     

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