2019 iMac Fan Noise.

Discussion in 'iMac' started by gmacattack73, Apr 30, 2019.

  1. gmacattack73 macrumors newbie

    Oct 8, 2013
    I'm experiencing some fan noise on my new 2019 iMac, and wanted to see if anyone else who's purchased one of the new machines is having a similar issue.

    I have a CTO model, with 3.7 Intel Core i5, 8 gb ram, Radeon Pro 580x 8 gb, and a 500 gb SSD.

    The fan is audible upon login, with no apps running. It's not running full blast or anything, but it is always audible when using the machine and the room is relatively quiet. In fact, when I check in Mac Fan Control the fan speed is hovering between 1195-1205 rpm, the lowest speed, and all the temps seem normal: 28 degrees ambient and between 35-40 for CPU and GPU.

    I want to know if anyone else who purchased a similar machine is also noticing this. I don't remember hearing the fan on any of my older iMacs, but I could be crazy or Apple could have opted to be more aggressive with the fan on this model to keep things cool.
  2. Giffel macrumors newbie


    Jul 11, 2017
    Unfortunately you are not crazy :eek:
    I have the exact same experience with my 2019 27", 3.1 i5 and SSD.
    It is louder than my previous two iMac's despite the fans running at the same speed.
    I am currently experimenting with lowering the fan speed to 1000 or 1100 rpm's and it makes a big difference, 1100 is barely audible, 1000 is not audible.
  3. gmacattack73 thread starter macrumors newbie

    Oct 8, 2013
    Hmm maybe it has to do with a design decision made by Apple for better thermals, given they've had problems with that in the past. Is there an app you'd recommend for adjusting fan speed below stock minimum? Have you noticed any negative effects from doing this regarding temps or performance?
  4. anaudiopro macrumors 65816


    Mar 7, 2017
    I have the maxed out i9 and have ZERO fan noise.
  5. Giffel macrumors newbie


    Jul 11, 2017
    I am using the method described here:
    Except i am currently using 1100 rpm as minimum.
    I have not noticed any downsides yet, just a quiet mac
  6. ZipZap macrumors 603

    Dec 14, 2007
    Maybe its the new machine hard drive indexing?
  7. neutrino23 macrumors 68000

    Feb 14, 2003
    SF Bay area
    Good thought. Check Activity Monitor CPU usage.
  8. kaintxu macrumors regular

    Jul 9, 2018
    that would be weird, I was running unigen heaven for like 30 min and I could clearly hear out the fans. As soon as I Stoped it they went silent. Is it Zero noise under workload or just browsing and such
  9. Nismo73 macrumors 6502a

    Jan 4, 2013
    Either your fan is broke, your ambient noise is louder than the fan, or you’re hearing doesn’t pick up the sound.
  10. propower macrumors 6502a

    Jul 23, 2010
    I remember one of the early Apple Insider video reviews (bas and i9 were both in it) saying the fans were slightly louder (and deeper sounding?) on the 2019s at 1200 RPM vs the 2017s. At higher loads the 2019s stayed quieter (more like 1800 RPM) where the 2017 i7 quickly went to max.
  11. amoergosum macrumors 6502

    Oct 20, 2008

    I also have the maxed out i9. There is fan noise but you have to be in a quiet room in order to be able to hear it.
  12. evilmurries macrumors newbie


    Mar 29, 2019
    Bay Area, CA
    My system has the same cpu / gpu configuration as the thread starter. I noticed fan noise when I first purchased it, but then it went away. I check it frequently, but it never came back even under moderate load.

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11 April 30, 2019