iMac Retina Heat management

Discussion in 'iMac' started by misho73, Oct 28, 2014.

  1. misho73 macrumors member

    Joined:
    Sep 26, 2014
    #1
    I just got my new iMac retina today. to replace the recently purchased late 2013 imac. I spend most of my time on lightroom. today while exporting my photoshoot, I heard the fan at it's max (during the export time) then calmed down once done. I never faced this issue with the non retina imac.
    Is this a sign of heat issues with the new machine??
     
  2. auwkeung macrumors member

    Joined:
    Apr 8, 2008
    #2
    it's definitely noisier than my late 2012 iMac
     
  3. FredT2 macrumors 6502a

    Joined:
    Mar 18, 2009
    #3
    No, it's just the cooling system doing it's job.
     
  4. Seramir macrumors member

    Seramir

    Joined:
    Nov 10, 2006
    #4
    More and more I'm glad I didn't prematurely sell my perfectly fine 2013 27" iMac and rush out to buy the Retina.

    Let's see what issues lies several months to a year down the road. Hopefully, it won't be a sad sight to see.
     
  5. DotCom2 macrumors 68040

    Joined:
    Feb 22, 2009
    #5
    GAWD DONT EVEN SAY THAT!
    After hearing today that Apple is getting sued for the MacBook gpu issue, I'm getting scared of buying into bleeding edge hardware.
     
  6. misho73 thread starter macrumors member

    Joined:
    Sep 26, 2014
    #6
    Don't buy the new one. Not because it's bad. You are not missing much. I would only recommend it for new imac buyers or for those who have a very old machines. Other than this. If you hold a beauty like urs. Keep it.

    ----------

    That's obvious. But it means that this particular model needs more cooling compared to older ones
     
  7. steve23094 macrumors 68020

    steve23094

    Joined:
    Apr 23, 2013
    #7
    Maybe, but there's only a couple of people here that have mentioned it. It may seem like more because one person has messaged bombed ten different threads with it.

    If you expect your fans never to kick in you're being unrealistic, they wouldn't put them in if they weren't needed.
     
  8. misho73 thread starter macrumors member

    Joined:
    Sep 26, 2014
    #8
    I am not panicking about it. I just comparing the two machines I held this month. with the exact work flow/load.

    I had the late 2013 one for 3 weeks and yes I never heard the fan kicking in with it. then I got the retina one just yesterday and it welcomed me with a horrific fan noise. not comforting at all
     
  9. leenak macrumors 68020

    Joined:
    Mar 10, 2011
    #9
    I've yet to hear my fan kick in. I don't do any video/photo work but I've been gaming on it. I haven't created my Windows boot drive yet though which is where I expect I'll hear the fan.
     
  10. Serban Suspended

    Joined:
    Jan 8, 2013
    #10
    no fan noise here...i know when 1800rpm is pass i hear the noice..especially in summer (like my imac late 2012 and 2013)
     
  11. nrubenstein macrumors 6502

    Joined:
    Aug 5, 2008
    Location:
    Washington, DC
    #11
    If you have horrific fan noise, you've probably got an issue.
     
  12. Nismo73 macrumors 6502a

    Joined:
    Jan 4, 2013
    #12
    I would like to know how much faster it is reaching the threshold in temperature where it starts to raise the rpm on the fan >1200rpm.
     
  13. misho73 thread starter macrumors member

    Joined:
    Sep 26, 2014
    #13
    "horrific" is a relative word. to me it's horrific cause I never heard it with the previous one during the 3 weeks I had it in possession. it happened one last night anyway. i hope it's not an exclusive issue with me

    ----------

    any idea how do I monitor the CPU temperature. I am new to mac
     
  14. xgman macrumors 601

    xgman

    Joined:
    Aug 6, 2007
    #14
    I posted this in another thread, (wouldn't call it bombing if you are referring to me above - sheesh) but at least on the 4ghz 295x version, it does seem that the is combination runs noticeably hotter than prior imacs and yes the fan runs (mostly at cpu load) much more often than prior imacs. It is very noticeable when working in Logic for instance where you can watch activity monitor rev the cpu which turns on the fan pretty regularly. It's not a deal killer, but is noticeable in comparison to what came before and yes, disappointing if you are sensitive to fan noise.
     
  15. FredT2, Oct 29, 2014
    Last edited: Oct 29, 2014

    FredT2 macrumors 6502a

    Joined:
    Mar 18, 2009
    #15
  16. Cameryn12 macrumors member

    Joined:
    Oct 24, 2014
    #16
    No, he's referring to me because I deigned to mention a design flaw in the m295X mobile graphics chip in three different threads, two of which were specifically about gaming. I'm waiting for him to install a hardcore game and iStat and see for himself what the temps on the GPU Die are...
     
  17. steve23094, Oct 29, 2014
    Last edited: Oct 29, 2014

    steve23094 macrumors 68020

    steve23094

    Joined:
    Apr 23, 2013
    #17
    Yes I was and with good reason. These are the posts you have left on the issue in six different threads excluding this one in just the few days you have been a member. Rather excessive don't you think? Just give it a rest.

    http://forums.macrumors.com/showthread.php?p=20230142#post20230142
    http://forums.macrumors.com/showthread.php?p=20226237#post20226237
    http://forums.macrumors.com/showthread.php?p=20230390#post20230390
    http://forums.macrumors.com/showthread.php?p=20245449#post20245449
    http://forums.macrumors.com/showthread.php?p=20207957#post20207957
    http://forums.macrumors.com/showthread.php?p=20226227#post20226227
    http://forums.macrumors.com/showthread.php?p=20226987#post20226987
    http://forums.macrumors.com/showthread.php?p=20228431#post20228431
    http://forums.macrumors.com/showthread.php?p=20230109#post20230109
    http://forums.macrumors.com/showthread.php?p=20230439#post20230439
    http://forums.macrumors.com/showthread.php?p=20231050#post20231050
    http://forums.macrumors.com/showthread.php?p=20231672#post20231672
    http://forums.macrumors.com/showthread.php?p=20232496#post20232496
    http://forums.macrumors.com/showthread.php?p=20229017#post20229017
    http://forums.macrumors.com/showthread.php?p=20232528#post20232528
    http://forums.macrumors.com/showthread.php?p=20238663#post20238663
    http://forums.macrumors.com/showthread.php?p=20239120#post20239120
    http://forums.macrumors.com/showthread.php?p=20239479#post20239479
    http://forums.macrumors.com/showthread.php?p=20240637#post20240637
    http://forums.macrumors.com/showthread.php?p=20207725#post20207725
    http://forums.macrumors.com/showthread.php?p=20210855#post20210855
     
  18. FredT2 macrumors 6502a

    Joined:
    Mar 18, 2009
    #18
    Design flaw? What evidence do you have that there is one?
     
  19. forg0t macrumors member

    Joined:
    Aug 13, 2014
    #19


    Yeah. I thought he was providing good info, but now that I see how many times he's posted the same info it makes me think he never owned the imac.
     
  20. DotCom2 macrumors 68040

    Joined:
    Feb 22, 2009
    #20
    Thanks for posting this.
    Now I'm not so worried.
     
  21. Seramir macrumors member

    Seramir

    Joined:
    Nov 10, 2006
    #21
    So why did you choose to upgrade to the Retina instead of keeping your 2013?

    And now that you have the Retina, plus learning and witnessing the potential issues it has, do you think the upgrade was worth it?
     
  22. misho73 thread starter macrumors member

    Joined:
    Sep 26, 2014
    #22
    I replaced it cause this is my first purchase for i mac ever. The 2013 model was still under the return policy period. So I had the chance to exchange. If i had it couple of months earlier i would have kept it without exhange thats why i advice those who have 2013 model not to rush for an upgrade.

    The answer to your second question is a dillama to me. Am i happy 100% the answer is no. Sure the screen is fantastic. But there are trade offs. So it's not really clear what was better for me. Having a flawlessly machine that works like water with an older technology or having the latest technology with minor issues?in the few coming days things will be clearer for me. It would have

    2 things that bother me with the new retina:
    - the fan at high speed that kicks more often compared to a by far more silent setup is so annoying
    - The stuttering that occurs in some situations

    I hope later os x updates may fix these issues
     
  23. Georgio macrumors 6502

    Georgio

    Joined:
    Apr 30, 2008
    Location:
    Essex, UK
    #23
    The AMD GPU runs hotter and draws more power than the equivalent Nvidia mobile chip.

    This was true of older iMacs that used the AMD GPU's so it's no surprise that these new RMacs run hotter than the 2012/2013 iMacs which used Nvidia GPU's.

    How this will affect the RMac machines in the long run is anyone's guess, but certainly if the fans are cutting in/out, then everything is working as intended.

    The big slab aluminium back of the iMac should be regarded as a giant heat sink, so as long as this remains fairly cool then there's no problem.

    On my old 2011 iMac I used a fan program called SMC fan control which allowed the user to manually control the fans and I found having the fans on very low all the time was better than having them cutting in/out all the time.
     
  24. FredT2 macrumors 6502a

    Joined:
    Mar 18, 2009
    #24
    The fan on new iMac is always on at 1200 RPM. It starts to be noticeable to me when it reaches 1500 RPM.
     
  25. FredT2 macrumors 6502a

    Joined:
    Mar 18, 2009
    #25
    I was curious about what would happen when both the CPU and GPU were stressed, so I ran a Handbrake encode and Unigine Valley together. Handbrake alone gets the CPU temperature to 100 C quickly and the CPUs throttle back to about 3.8 GHz. The fan runs at max (2700 RPM). Unigine Valley alone gets the GPU temperature a little over 100 C. The fan gets up around 2300 RPM. The effect of running them together is that the CPUs throttle back to 3.3 to 3.4 GHz and Unigine Valley got a bit choppy. Even so, I could play 1080p videos, browse the web, etc, with everything nice and smooth.
     

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