GPU Fan control

Discussion in 'Mac Pro' started by Ih8reno, Aug 18, 2017.

  1. Ih8reno macrumors 65816

    Ih8reno

    Joined:
    Aug 10, 2012
    #1
    Hi all

    I installed a Sapphire RX 460 4gb in my mac and it works great except for one thing. The fans ramp up every few minutes. Is there anything I can do about this. Its very annoying hearing the buzzing of the fans. Would there be a fan control app I can use on this model.
     
  2. _Kiki_ macrumors 6502

    Joined:
    Aug 13, 2017
  3. h9826790, Aug 18, 2017
    Last edited: Aug 19, 2017

    h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #3
    If it's the PCIe fan, all you need to do is run Luxmark for few seconds, then it should go back to normal. But if it's really the graphic card's fan. Then there is not much you can do, unless you willing to edit the VBIOS and flash the card.

    MacsFanControl can also force the PCIe fan run at a lower speed, but you will also lost the overheat protection. In general, there is no big deal, because the PCIe doesn't provide direct cooling to anything.
     
  4. Ih8reno thread starter macrumors 65816

    Ih8reno

    Joined:
    Aug 10, 2012
    #4
    yeah its the fans for the gpu. Not too sure about flashing it

     
  5. h9826790, Aug 19, 2017
    Last edited: Aug 19, 2017

    h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #5
    If you sure it's the fan on the graphic card's, is there any pattern? e.g. You can hear the fan spin up (usually only a little bit) when you scrolling in a web browser?
     
  6. Ih8reno thread starter macrumors 65816

    Ih8reno

    Joined:
    Aug 10, 2012
    #6
    I think you may have solved it. I will continue testing but when I use safari as a browser I (so far) haven't heard the gpu fan spin up. However when I use my firefox browser it randomly comes on and off.
     
  7. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #7
    Some GPU come with a very aggressive fan profile. Since all modern browser use GPU to accelerate. When you scrolling up and down, the GPU and the associated VRAM actually work a bit harder than "just display something (2D idle)". In some case, it's just strong enough to trigger the fan to spin up (keep jumping above and below the "fan spin up threshold". Therefore, you will able to hear the fan on and off. In fact, if the demand is bigger, and make the fan keep spinning at a faster RPM, you may not notice it at all. But when the noise signature keep changing, it's very easy to catch your attention.

    One of the easy test is browning Facebook. It's quite demanding (as a webpage), and can use lots of VRAM. Also, you can keep scroll down forever (particular useful for this test). If you can hear the fan spin up and down when browsing in Firefox. Then I am quite sure there is no solution in MacOS apart from flashing your card (with a more gentle fan profile).

    Anyway, you may still try to stress the card a bit after boot to desktop. Luxmark for 10 seconds is good enough. Just in case the power control bug not just affect the PCIe & PSU fan, but also make your card unable to correctly stay at low power mode.

    If you can hear the fan spin up before stress test (e.g. using Firefox), then try to stress it for few seconds and do the test again. If no more fan noise, then it means your card need something to stress it EVERYTIME after you boot to desktop. Otherwise, it won't work properly.

    But if the fan still spin up and down after stress test. Then I am 99.99% sure flash it is the only way to fix it.
     

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