Powered Cooler & Throttling

Discussion in 'MacBook' started by Queen6, Jun 9, 2015.

  1. Queen6, Jun 9, 2015
    Last edited: Jun 9, 2015

    Queen6 macrumors 603

    Queen6

    Joined:
    Dec 11, 2008
    Location:
    Enjoying Better Things
    #1
    All those who own the Retina MacBook are well aware of the "sprint" nature of Core M, and subsequent throttling under sustained heavy loads, which for some precludes any form of "heavy lifting "

    My own 1.2 holds 1.9GHz - 2GHz with all Core`s lit up holding at around 8W plus, then it will drop off to 1.3GHz, surging back to 2GHz, thermal throttling is in effect. Now place the Notebook on a small powered cooler, turn it on, and you can watch (Intel Power Gadget) the MacBook recover from the throttling event. The 1.2 MacBook will now hold 2GHz, as long a the cooler is running...

    Not entirely practical on the go, however if you do need to push the Retina MacBook, this does appear a method to hold the higher frequencies.

    Fully charged on mains supply;
    • Ambient 26C (78.8F)
    • CPU total load 99.9%
    • CPU Temp 92.2C (197.96F) @ 2.00GHz

    Have doubts, give it a try :) biggest impact I have ever observed with a Mac when using powered cooler :apple:

    Q-6
     
  2. MyopicPaideia macrumors 68000

    MyopicPaideia

    Joined:
    Mar 19, 2011
    Location:
    Trollhättan, Sweden
    #2
    It is illustrated pretty clearly on this other new thread with a video pf the guy setting the MB in a tray of water giving the same results.

    Pretty neat!
     
  3. Queen6 thread starter macrumors 603

    Queen6

    Joined:
    Dec 11, 2008
    Location:
    Enjoying Better Things
    #3
    True, equally impractical. The powered elevator I tired is a third of the MacBooks footprint and drops the temps significantly, allowing the CPU to turbo boost without restraint.

    Q-6
     
  4. MyopicPaideia macrumors 68000

    MyopicPaideia

    Joined:
    Mar 19, 2011
    Location:
    Trollhättan, Sweden
    #4
    No no, of course, not implying that what the video shows is a practical way to do it, just saying it illustrates that a little cooling goes a loooooong way with the core M, which is pretty neat.
     
  5. Queen6 thread starter macrumors 603

    Queen6

    Joined:
    Dec 11, 2008
    Location:
    Enjoying Better Things
    #5
    True, Just a little investigative fun :)

    Q-6
     
  6. jimboutilier macrumors 6502a

    Joined:
    Nov 10, 2008
    Location:
    Denver
    #6
    One of the first things I tried when getting my 1.3ghz rMB was testing its heat throttling characteristics and the impacts of a few cooling pads I had purchased or cobbled together over the years.

    In normal 20C room temperature, under max load the CPU would quickly jump to 94C (from about 42C at idle), then throttle to remain below 95C. You noticed the performance drop (maybe 20%?) but it wasn't horrible. And as soon as the load went away the temps would drop and throttling would be suspended once temps got back to normal for a bit.

    With a normal "granule filled" cooling pad, temps rose slightly slower and throttling was slightly lower, but nothing significant. A gel pad or fan pad worked better and throttling was reduced significantly but still occurred for me.

    A true cooling pad (air flow or gel pad contact at a constant 5C) completely eliminated throttling and CPUs never got past about 80C. But its not really practical for portable or travel use. The dual core M is still no powerhouse but it was an interesting experiment that points to better performance in cooler environments and worse performance in hotter environments.
     
  7. airattack111 macrumors member

    Joined:
    Dec 9, 2008
    #7
    Does anyone make a cooling pad for the rMB? It would seem like you would have to put thermal paste on the aluminum to get any cooling affect haha.

    I'm getting a clear skin for this and will probably cut out the skin where the motherboard is so it can still get natural air cooling without having a big sticker over the aluminum.
     
  8. Queen6 thread starter macrumors 603

    Queen6

    Joined:
    Dec 11, 2008
    Location:
    Enjoying Better Things
    #8
    The powered cooler I have is ancient, equally it`s quiet and approximately a third of the size of the rMB. All you need is air flow across the base of the Unibody.

    Adding a skin should not make a big difference, equally it`s a adding a thermal barrier, recommend you try "before and after" or leave the base plate bare. From my own observations with Core M small things add up, and I also get a "kick" out of doing more with less...

    Q-6
     
  9. keviig macrumors 6502

    Joined:
    Jun 7, 2012
    #9
    Even something as simple as a USB fan at the back of the machine is enough to keep mine from throttling. Just having some airflow under the unibody seems to be enough.
     
  10. Theozz macrumors member

    Theozz

    Joined:
    Jun 4, 2015
    #10
    What powered cooler do you use? I'm curious ;)
     
  11. Queen6 thread starter macrumors 603

    Queen6

    Joined:
    Dec 11, 2008
    Location:
    Enjoying Better Things
    #11
    :) It`a an old ProMate proStation.3, it`s physically about a third the size of the MacBook. Initially I thought it would work well as a stable riser. Power up the fan can & does make a significant difference, pleasantly surprised.

    Q-6
     

    Attached Files:

Share This Page