istat and coolbook temps, which one is correct?

Discussion in 'MacBook Air' started by aleni, Dec 21, 2008.

  1. aleni macrumors 68020

    Jun 2, 2006
    I have set iStat to monitor the cpu temp only. but the difference between it and the coolbook sensor is big.

    iStat currently sitting on 50C, while Coolbook is only at 43C.

    which one should i believe. i prefer coolbook, because when i run a big cpu-demanding task. iStat says it's 109C while when i touched the machine and i'm sure it's not that hot like it's going to cook the egg.
  2. fteoath64 macrumors regular


    Nov 16, 2008
    Wow 109 Deg C ?. Thats pretty hot!. Mine never breached 85 DegC because the fans kicked in early to 6200 and stabilize the temp to 70+ then drops to about 55C normal. The CPU temp is taken inside the die (on chip diode sensor), while HeadtSink A is on the heatsink itself, that is conducting the heat away. So it is 4-6 Deg difference. The outside metal above the brightness keys will get very warm to the touch but not burning the figure.
  3. justit macrumors 6502a

    Dec 1, 2007
    Both istat and smcfancontrol show the same readings, with istat showing a breakout of other system temps. Is it possible coolbook takes an average of several sensors to give a reading?
  4. SFStateStudent macrumors 604


    Aug 28, 2007
    San Francisco California, USA
    +1 ^^^ I've never used Coolbook, but I've installed smcFanControl and iStats Pro and they seem to be all I need. Usually both are within 1-3º of each other...:cool:
  5. aleni thread starter macrumors 68020

    Jun 2, 2006
    so the istat is the correct one for the cpu? but i when i touched the cpu part on my air it's not like 100c while the istat is monitoring it as a 100c. it's not really that hot when touched.
  6. pstoehr macrumors member

    Aug 5, 2003
    Scheßlitz, Oberfranken, Bavaria, Germany
    the temperature is measured inside the CPU.
    Have you opened the CPU and your MBA is still working?

    Just kidding:D

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