2011 base 21'5'' iMac - defoult fan speed

Discussion in 'iMac' started by brachson, Aug 11, 2011.

  1. brachson macrumors member

    Nov 14, 2010

    I was playing with Fan Control and now I am not sure what are defoult settings for fans speed. I have:
    Optical Drive: 1500
    CPU: 1000
    HD: 1200

    Is it defoult and correct?
  2. zstern702 macrumors member

    Sep 26, 2010
    first off its DEFAULT.. and you should not mess with things if you dont know how to use it... i belive there is a reset button some where in the program
  3. John T macrumors 68020

    John T

    Mar 18, 2006
    Why on earth would you want to play with fan control?

    Just leave things alone and let your machine get on with what it's supposed to.
  4. Spike88, Aug 11, 2011
    Last edited: Aug 11, 2011

    Spike88 macrumors 6502a

    Jan 25, 2010
    Many of the 3rd party FAN control software will NOT (cannot) be set lower then Apple's H/W minimum. Especially SMC Fan Control 2.3 software @ http://www.macupdate.com/app/mac/23049/smcfancontrol -> which is on MacUpdate Support Service site.

    To determine Apple's minimum FAN RPM value for your 2011 iMac 21.5" box, simply install iStats Nano (which is a free widget) and remove 3rd Party Fan control. Yes, 100% remove 3rd party fan control software. Using a cold (sitting for 3+ days without usage) iMac system, immediately start iStats Nano application and records its "cold value" fan speeds. For my 2010 iMac 21.5" - i3 / 3.2 box, I think the minimum default fan speeds are 900 and 1000 RPMs. At those low RPMs at 23C ambient, its insides heats up "too much". Using 3rd party Fan Control software (like SMC control 2.3 - which is their most recent version), I set the fans to minimum 1300. Yes. 300 RPMs faster them factory minimum. Currently, my iMac fans are at 1390 and its internal HDD is now within perfect 35 - 48 range. The factory minimum default for a 2011 iMac 21.5" could be slightly higher - at 1,300 rpms. If so, I would set to custom "minimum " between 1,450 - 1,550 RPMs (using 3rd party fan control software) - to ensure its insides remains cool as well.

    As one can tell from previous posts, I love SMC Fan control 2.3 software. It keeps my 2010 iMac's insides much cooler (which means better odds of longer life) and I can feel the top of its screen without burning my finger either. Many positives in this 3rd Party software. For details of my iMac's 21.5 FAN RPM settings (HDD temp at 38C), surf: http://i178.photobucket.com/albums/...Mac system/SMC_Fan_Control_23onAug11-2011.jpg

    Hope this helps in your research...
  5. brachson thread starter macrumors member

    Nov 14, 2010
    I had problem with background noise during the skype calls but I have no idea why is it important why I did that? You comment has zero (0) added value.
  6. brachson, Aug 11, 2011
    Last edited: Aug 12, 2011

    brachson thread starter macrumors member

    Nov 14, 2010
    Anyway could anyone please download Fan Control or iStat Pro on his 21,5'' and w/o changing anything let me know what are the fans speed in iddle?

    thank you!

    Found it here:
    Temps & Fans
  7. andalusia macrumors 68030


    Apr 10, 2009
    Manchester, UK
    Even with fan control software, the fans will ramp up automatically regardless of what the software is set to, depending on the temperature of the system of course. Iirc Smcfancontrol is mainly for manually raising the fan speed higher than is strictly necessary.

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