iMac NEW Fan Speeds??

Discussion in 'iMac' started by dasx, May 17, 2017.

  1. dasx macrumors 65816

    dasx

    Joined:
    Jun 18, 2012
    Location:
    Barcelona
    #1
    Hi!

    I own a top tier 5K Retina iMac end-2014. I use it for heavy 4K work: importing, transcoding, editing and exporting. Very high temps regularly. CPU around 90-100ºC and GPU at 103-107ºC, since DAY 1.

    Well, every since I bought I installed iStat Menus and I usually watch CPU and GPU temps as well as fan speeds, because sometimes I manually put them to HIGH to help cool down the computer further.
    Top fan speeds always were 2700rpm. ALWAYS. I recently had some reboot and heat problems because of the GPU surpassing 110ºC and fans never went higher than 2700rpm.

    BUT, since a couple of days back I noticed my fans are now spinning at 3300rpm. CPU temp doesn't go beyond 85ºC, and the GPU is at 99-100ºC when exporting the same 4K type of video.

    Has anyone else noticed this? Did I miss something?

    Thanks!
    dasx
     
  2. T'hain Esh Kelch macrumors 601

    T'hain Esh Kelch

    Joined:
    Aug 5, 2001
    Location:
    Denmark
    #2
    Dust in the exhaust, high ambient temperatures, drying thermal paste, etc.
     
  3. dasx thread starter macrumors 65816

    dasx

    Joined:
    Jun 18, 2012
    Location:
    Barcelona
    #3
    Either I didn't make myself clear or you didn't understand me at all.

    Fan speed always had had a top speed of 2700rpm. Since a couple of days ago, it now has a top speed of 3300rpm. Forget about temperatures, that was a background.
     
  4. JustMartin macrumors 6502a

    Joined:
    Feb 28, 2012
    Location:
    UK
    #4
    obvious question is did you upgrade to 10.12.5 when that became available a couple of days back? Would narrow things down a little in terms of recent changes.
     
  5. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #5
    2700rpm is 100% the fans max. I'm wondering if your fan control software is falsely reporting the speed. You would defiantly hear a difference with a 600rpm increase.
     
  6. dasx thread starter macrumors 65816

    dasx

    Joined:
    Jun 18, 2012
    Location:
    Barcelona
    #6
    I do. If it's at 3300rpm and I manually set it to MAX in iStat Menus, speed drops to 2700rpm and noise is quieter.
     
  7. dlewis23 macrumors 6502a

    Joined:
    Oct 23, 2007
    #7
    Get a can of air and blow out the iMac from the exhaust then from the bottom. Had a similar issues but mine would turn off because the GPU would get to 109ºC.
     

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