MP 1,1-5,1 Mac Pro loud at startup

[M3Stang]

Hello Everyone,

I have a Mac Pro 4,1->5,1 with the X5680 (I think that's what I put its 3.33GHz 6c/12t) and a Sapphire Pulse RX 580 (The one officially compatible with Mojave). I noticed that ever since I put the RX 580 in here, replaced from the GT 120, the Mac sounds like a jet getting ready to take off at startup. After maybe 5-10 minutes it winds down to whisper silent for hours on end, and even exporting 4K videos I barely hear it. I was wondering if anyone else experienced this when putting an RX 580? I am pretty sure it is the GPU fans, not the system ones. It does not really bother me since it goes away, more curious than anything if I am alone here.

 

[throAU]

Most third party PC video cards ramp the fans to full blast until the OS driver takes over control of it and sets up a more reasonable fan curve.

They do this on desktop PCs as well.

 

[kohlson]

I don't much notice anymore. But mine works (worked) this way: on startup/login the RX580 would run fans full speed. They would continue for some time if nothing was happening. But if I brought up any app that required it, even Safari, they calmed right down.
As well, if the cMP went to sleep, on waking they would really howl for a little bit. Almost seems like it shut down at sleep without a proper cool down, and made up for it on wake up.

 

[Macschrauber]

Many GPUs do this. Maybe it's for spitting out some dust

 

[cdf]

You can use AirOut to automatically calm down the fans on startup.

AirOut: A solution to the racing fan bug

Introduction The racing fan bug is a well known issue that affects certain cMP systems with upgraded video cards, particularly systems with SMC version 1.39f5. On these systems the PCI, PS, and booster fans spin abnormally fast at idle, causing unnecessary noise. Although the issue appears to...

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