Upgraded Graphics Cards and PCI Fans Speed

Discussion in 'Mac Pro' started by lastmile, Apr 22, 2018.

  1. lastmile macrumors regular

    Mar 10, 2008
    I’ve got a 4,1 with 5,1 firmware running a six-core 3.46 GHz and a flashed reference EVGA 2GB GTX 680.

    It’s doing the annoying fast PCIe slots fan thing.

    I’ve gone through a couple of OSs and can’t remember if there are any that didn’t cause this to happen.

    It was running a flashed XFX dual fan 6870 which did not cause the fans to act this way.

    I know this is supposed to be fixable by running a graphics intensive app at start up.

    I don’t recall my previous 4,1 (with 4,1) firmware doing this with a flashed 680 GTX.

    Is there a known combination of Mac model, firmware, and graphics cards (or a minimum power draw) that causes this to happen? Does it happen with all flashed 4,1s?

    This is annoying me enough that I’m considering downgrading or using an older MP especially since I’m turning to PCs for more processor or graphics intensive tasks.
    --- Post Merged, Apr 22, 2018 ---
    Never mind... think I found some posts that are answering my questions
  2. Darmok N Jalad macrumors 65816

    Darmok N Jalad

    Sep 26, 2017
    It's just something that happens. The easiest thing I found to make it stop is use something like LuxMark to get the GPU up to 100%. Once it runs through the benchmark, the PCI fan will settle back down. Usually this fan and the PSU fan like to act up when you go from Windows to MacOS and vice versa.
  3. Riku7 macrumors regular

    Feb 18, 2014
    I used to have the problem but for some reason it no longer persists.

    When it was present, I had OpenGL Extensions Viewer set to launch automatically upon start-up. You go to the "Tests" tab, and then start the test. A 3D rendered cube will spin for a while, and the fans will calm right down. Very quick and much less annoying than having to launch a game or something like that.
  4. h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
    MacsFanControl’s PCIe fan setting can override that bug. You can set a fan profile base on the PCIe ambient temperature, and let it auto start during login.

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