temperature problem on i5 MacBook Pro?

Discussion in 'MacBook Pro' started by applefieddarwin, Jun 7, 2010.

  1. applefieddarwin macrumors newbie

    Dec 9, 2009
    I have a 2.4Ghz i5 MacBook Pro, and noticed something strange/interesting, and I am wondering it there is something wrong.

    I decided to encode something in Handbrake, and noticed that through iStat, the CPU temperatures touched 200 degrees F. even with such high temperatures, the fans remained at 2000 rpms. Is there a problem here?

    I feel that the fan speeds are not dependent on the CPU temperatures, but the CPU heatsink temperatures. While the CPU was at 200 degrees F, my heatsink remained at 130 degrees F. Has thermal paste been horribly applied to warrent such a big difference in temperatures (then possibly leading to the low fan speeds?)
  2. GGJstudios macrumors Westmere


    May 16, 2008
    The fans won't spin up faster unless the higher heat is sustained for a period of time.
  3. applefieddarwin thread starter macrumors newbie

    Dec 9, 2009
    thanks for the answer. I guess I will try it out (see if the fans spin up if i leave them alone).

    Can you explain the discrency between the heatsink and the CPU diode? I think 70 degrees F difference is a little excessive.
  4. GGJstudios macrumors Westmere


    May 16, 2008
    Your MBP knows how to monitor temps and control the fans, accordingly. You really don't need to try to "micro-manage" the process. Just use your Mac and let it take care of itself, as it's designed to do.
  5. Pax macrumors 6502a

    Dec 12, 2003
    GGJStudio's advice, as always, is excellent.
    Don't worry about it
    Use MRoogle to search, you will see dozens of threads on here, they'll help reassure you.
  6. C64 macrumors 65816


    Sep 3, 2008
    When smokes comes out of the back though.. something is wrong ;)
  7. GGJstudios macrumors Westmere


    May 16, 2008
    Not necessarily. Could be one of those models with the SSCS, as a backup, in case WiFi isn't available. :D
  8. applefieddarwin thread starter macrumors newbie

    Dec 9, 2009
    Thanks guys. I'll take your word, and just let the computer do its job.
  9. bzshutter macrumors newbie

    Mar 25, 2009
    Actually, I kind of doubt the newer MBP knows how to "take care" of themselves that well. I just got a i7 2.66 MBP and the machine allows the CPU temps to get way too high before the fans start to spin up from 2000 rpm. I ran a Cinebench session and the CPU went to 90 C before the fans even started to spin up. By the time the fans were in full speed, the CPU had already touched 100C. I know that it's still not quite at TDP yet, but any CPU running at 90 C+ for prolonged periods of time can't be very healthy. It certainly isn't healthy to the user if they happen to have the machine sitting on their lap! That would leave a red mark pretty quickly.
    By comparison, my 2007 MBP does a much better job of trying to cool things down before it gets out of hand. Sure the fan noise is much louder by doing this, but I'd much rather tolerate the noise than to have my expensive machine sitting there happily cooking itself. I think Apple has gone too far in trying tune the machine for quietness and sacrificing long term reliability of the machine.

    Any way to adjust the smc control parameters ? I know there is smcFanControl, but it doesn't seem to allow temperature based speed adjustments.
  10. diablo2112 macrumors 6502

    Apr 16, 2010
    It's within Intel specs for the i5/i7. I wouldn't worry about it. These "my MBP temps are too-high" posts come up all the time, Intel and Apple engineers are informed on these issues and made the necessary design choices to balance temperature, geometry, performance, noise, and longevity.
  11. applefieddarwin thread starter macrumors newbie

    Dec 9, 2009
    Yea. I use SMC fancontrol. I just think that when it comes to fan speeds and noise, Apple always makes a compromise in all their computers. So for very intensive work, like encoding movies or playing games, I pump up my fans to around 5000 rpms.

    In my old early 2008 MacBook Pro, I used a utility called fancontrol 1.2. Just google it. It allows temperaturre based speed adjustments. But when I installed it on my i5, it had problems reading the fans and temperatures, so I deleted it.
    I guess all I can say is try at your own risk.
  12. I'mAMac macrumors 6502a


    Aug 28, 2006
    In a Mac box
    About your comment on thermal paste...yes it is horribly applied. If you don't believe me, open up your MBP and have a look for yourself ;)

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