55* Celsius and 6200 RPM

Discussion in 'MacBook Air' started by puma1552, Jul 5, 2009.

  1. puma1552 macrumors 601

    Joined:
    Nov 20, 2008
    #1
    The past couple weeks here at work with my Rev B. base MBA, where they haven't turned the AC on yet (it's 26* C in the staffroom here at the school I work at), my Air has been spinning 6000+ despite the computer temps only being mid-upper 50s.

    Yeah, it's warm in here, and it's definitely humid, but the computer's temps simply aren't high enough to warrant 6200 RPMs...ideas why?
     
  2. macJC50640 macrumors regular

    Joined:
    Jan 19, 2009
    #2
    Is the fan ALWAYS spinning at the same speed? What are you doing on your computer, anything graphics/CPU intensive?
     
  3. isaaclimdc macrumors 6502

    isaaclimdc

    Joined:
    Jun 28, 2009
    Location:
    Pittsburgh, PA
    #3
    Woah 6000+? The MacBook Pros don't even have that kind of fan speed capability. Try using smcFanControl (http://www.eidac.de/). It's a great piece of freeware.
     
  4. puma1552 thread starter macrumors 601

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    Nov 20, 2008
    #4
    It just happens here at work where it's humid and I only have one or two browsers and skype running.

    I have SMC--that's what I'm using to monitor the fan speed (not adjusting it though, just monitoring).
     
  5. Eidorian macrumors Penryn

    Eidorian

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    Indianapolis
    #5
    What are you doing in your browsers and Skype? I'd give a SMC reset a try first.
     
  6. puma1552 thread starter macrumors 601

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    Nov 20, 2008
    #6
    Just forum browsing/email. Nothing intensive like Flash or anything.

    Did both a PRAM and SMC reset, getting the same thing. Currently 56*C and 6200 RPM.
     
  7. isaaclimdc macrumors 6502

    isaaclimdc

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    Pittsburgh, PA
    #7
    Why don't you adjust the fan speed with smc then?
     
  8. puma1552 thread starter macrumors 601

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    Nov 20, 2008
    #8
    Shouldn't have to, besides that only let's me adjust the minimum anyway--I can't slow the fans down.
     
  9. Nak macrumors newbie

    Joined:
    Feb 4, 2008
    Location:
    Portland, OR
    #9
    puma1552,

    I have the following in an AppleScript that runs at startup to set the max fan speed. I've found that 5000rpm max is a good tradeoff between noise and cooling efficiency.

    =========================
    -- Set max fan speed
    -- 4000 RPM => 3e80
    -- 5000 RPM => 4e20
    -- 6000 RPM => 60e0
    do shell script "/Applications/smcfancontrol/smcFanControl.app/Contents/Resources/smc -k F0Mx -w 4e20"
    =========================

    Note that when you sleep your Mac, the max setting is reset. To get around this, you have to install SleepWatcher (http://www.bernhard-baehr.de/) and put the shell command above in a .wakeup file in your home directory. This way when your Mac wakes up from sleep, the command is rerun to set the max fan speed.

    Works great for me.

    Nak
     
  10. ayeying macrumors 601

    ayeying

    Joined:
    Dec 5, 2007
    Location:
    Yay Area, CA
    #10
    If its warm and humid, the system will run the fans at max.
     
  11. appleguy123 macrumors 603

    appleguy123

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    Apr 1, 2009
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    #11
    dosnt that only set the minimum and not the maximum?
     
  12. puma1552 thread starter macrumors 601

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    Nov 20, 2008
    #12
    At home in the AC it workes fine, upper 40s and 2000 RPM at idle.

    Right now at work again it's 53*C and 6200 RPM again.

    I realize it's hot so the computer should run hotter with a higher fan speed, but it makes no sense to be spinning at 6200 RPM if the computer is holding constant at 53*C.
     
  13. ayeying macrumors 601

    ayeying

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    Dec 5, 2007
    Location:
    Yay Area, CA
    #13
    You're only reading the CPU temp. You're forgetting the other temps such as GPU, Ram, Motherboard temps, enclosure temp, ambient temp. They all effect on how the fan is running.
     
  14. orpheus1120 macrumors 65816

    orpheus1120

    Joined:
    Jan 23, 2008
    Location:
    Malaysia
    #14
    Are you plucked into any AC supply? If so, the fan will kick in at a higher rpm.

    At 55 celsius, the fan shouldn't run at 6200rpm.
     
  15. puma1552 thread starter macrumors 601

    Joined:
    Nov 20, 2008
    #15
    That's a good point as well.

    They finally turned on the AC here at school, and now my fan is back down to 2000 RPM, with the temp hovering around the same as before, as it should be.

    I wonder if the fans have some dependency on humidity since as soon as the air got drier in here the fan speed went back to where it was supposed to be?
     
  16. puma1552 thread starter macrumors 601

    Joined:
    Nov 20, 2008
    #16
    Alright so in the past couple hours it's been seeming to cycle--it will go down to 2000 for a while and then shoot up to 6200 for a while, and then keep doing this cycle, though it will spend a good 20-30 minutes at full blast and then maybe 5-10 at where it should be.

    It's cool in the staff room here.

    Should I take it in? Logic board?
     
  17. Miker2k macrumors regular

    Joined:
    Feb 2, 2009
    #17
    Is there a utility that will produce a graph of Temps vs Fan Speed over time? I know that iStat will show me what's going on now but I would be curious to see a graph over the course of 24 hours.
     
  18. Barbie macrumors regular

    Barbie

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    Jan 28, 2009
    Location:
    ocean
    #18
    Wirelessly posted (iPhone 3.0: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_7; en-us) AppleWebKit/530.18 (KHTML, like Gecko) Version/4.0.1 Safari/530.18)

    That is precisely what's up with my Rev B solid-state Air too !!!

    The processor isn't doing anything intensive whatsoever, but the fan speed rockets to around 6200 RPM, and according to iStat, once it ran at 6250 RPM - unbelievable

    That was during a heatwave here, but since the heatwave concluded, the Air is blowing fine.

    Barbie
     
  19. ayeying macrumors 601

    ayeying

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    Dec 5, 2007
    Location:
    Yay Area, CA
    #19
    Is the system idle or are you doing anything? If its idling, and its at 2500RPM, it shouldn't shoot up to 6200 for no apparent reason.
     
  20. MontyC macrumors member

    MontyC

    Joined:
    Jun 17, 2009
    Location:
    London Uk
    #20
    I had a MBA and it *always* ran at 6200 RPM fan speed unless I am in a super cold air conditioned room. I now have a MacBook Pro and that hardly ever reaches 2000 RPM. I think it is the reality of the MBA design
     
  21. puma1552 thread starter macrumors 601

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    Nov 20, 2008
    #21
    just have maybe one or two browsers open looking at forums, and maybe skype...that's it.
     
  22. Teh Don Ditty macrumors G4

    Teh Don Ditty

    Joined:
    Jan 15, 2007
    Location:
    Maryland
    #22
    If you're running skype, or more to the point using the video aspect you will be taxing the processor thus increasing the fan speed.

    I don't have an MBA, but on my MBP 15" and UMBP 13" my fan speeds will increase according to the temps (60-70C).

    As others have said download smcfancontrol.
     

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