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  1. #1


    Member Since
    Mar 05, 2012
    Posts
    157
    What is the allowable fan speeds in rpm?
    Hey all,

    Another quick question. Using Istat nano, what is the typical fan speed for the three fans?
    Since I got my 2011 iMac 21.5. My speeds are as follows:

    optical 1398rpm
    Hard drive 1100rpm
    Cpu Fan 1200 rpm

    I only have safari running, is this normal? If not what is normal?

    Thanks,
    Hwilensky

  2. #2

    Raz0rEdge's Avatar
    Member Since
    Jul 17, 2009
    Location
    MA
    Posts
    8,612
    Specs:
    27" i7 iMac, 24" iMac, 13" Macbook Air, iPhone 6S, iPod Nano 7th GeniPad 3
    The fans will vary in speed based on a lot of things like ambient temperature, internal component temps and load and so on..

    So don't just look at the fan speed, look at the temps first..

    Right now, my 27" iMac is showing:
    CPU - 37 degC
    HD - 37 degC
    Ambient - 17 degC
    Optical - 29 degC

    Fan speeds:
    Optical - 999 rpm
    Hard Drive - 1142 rpm
    CPU - 940 rpm

    I have a few apps up and my system has been running for 20 days now..
    --
    Regards
    ...Ashwin



    Be sure to read the Community Guidelines | The more information you provide, the better answers you get, remember GIGO.

  3. #3


    Member Since
    Mar 05, 2012
    Posts
    157
    Thanks for the help. Here is my temps. And it has been running for 2 days, should I be worried?

    Thanks,
    Hwilensky
    Attached Images Attached Images

  4. #4

    McBie's Avatar
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    Apr 26, 2008
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    Belgium
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    Specs:
    2013 MBA 13" - OS X 10.11.latest
    If these temps are in Celcius then you have nothing to worry about.

    Cheers ... McBie
    A computer lets you make more mistakes faster than any invention in human history - with the possible exceptions of handguns and tequila.
    The bitterness of poor quality remains long after the sweetness of low price is forgotten.

  5. #5


    Member Since
    Mar 05, 2012
    Posts
    157
    Quote Originally Posted by McBie View Post
    If these temps are in Celcius then you have nothing to worry about.

    Cheers ... McBie
    I am assuming they are. If those are the temps, then I do not need to worry about my fan's rpm being so high?

  6. #6


    Member Since
    Mar 05, 2012
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    Here they are in Fahrenheit.
    Attached Images Attached Images

  7. #7

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    49,099
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    I use iStat Menus 3 (licensed, not freeware) so my temperatures are measured a bit differently than yours. However, for my iMac 2011 21.5" machine the fan speeds are as follows:

    CPU = 1200 rpm

    HD = 1098 rpm

    OPT = 998 rpm

    They pretty much stay that way from day to day. I don't leave my machine on all the time because of the severe weather we get here in Texas but after an 8 hour run the speeds are what I reported above.

    Just make sure that the intake vents at the bottom of your display housing are free and clear. The same goes for the exhaust vent at the top of the display.

  8. #8


    Member Since
    Mar 05, 2012
    Posts
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    So I have nothing to worry about then. My fan speeds are ok?

  9. #9

    baggss's Avatar
    Member Since
    Oct 10, 2004
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    10,320
    Specs:
    3.4 Ghz i7 27 in iMac (2012), 3.4 Ghz i7 MacBook Pro (2015), iPad Pro (2014), iPhone 6+
    Yes. You're fine.


  10. #10


    Member Since
    Mar 05, 2012
    Posts
    157
    Quote Originally Posted by baggss View Post
    Yes. You're fine.
    Thanks. I was just curious because in Razors example, my rpm's where higher then his, yet my temps were lower. Thanks baggss.


    Hwilensky

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