Noctua NH-D15 fans spin to maximum revs at startup, very loudly - Overclock.net - An Overclocking Community

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Noctua NH-D15 fans spin to maximum revs at startup, very loudly

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post #1 of 44 (permalink) Old 07-29-2020, 09:53 AM - Thread Starter
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Noctua NH-D15 fans spin to maximum revs at startup, very loudly

Hi!
When I launch my PC it is very loud for several seconds. It is Noctua NH-D15 and it connected to CPU_FAN and CPU_OPT 4 pin connectors on Gigabyte X570 Aorus Elite motherboard. Both fans work in PWM control mode. BIOS version is F11.

Is this normal or can it be fixed some way?

Video (with sound):

AMD Ryzen 9 3900X
Noctua NH-D15
Gigabyte X570 Aorus Elite (bios F11)

This lasts since I built this PC and now I'm tired of this sound a little. Also, it can wake up my wife.
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post #2 of 44 (permalink) Old 07-29-2020, 10:00 AM
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Hello and welcome to OCM.

Some motherboards do this to make sure fan spin up to speed. You might be able to do something in Bios, but I don't know. Hopefully someone familiar with your mobo can help.

You could try the Low Noise Adapters that came with D15. They usually lower rpm about 30%. That might be enough to not wake up wife.

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post #3 of 44 (permalink) Old 07-29-2020, 10:28 AM - Thread Starter
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Quote: Originally Posted by doyll View Post
Hello and welcome to OCM.

Some motherboards do this to make sure fan spin up to speed. You might be able to do something in Bios, but I don't know. Hopefully someone familiar with your mobo can help.

You could try the Low Noise Adapters that came with D15. They usually lower rpm about 30%. That might be enough to not wake up wife.
Thanks for the answer!
I suspected that the motherboard is the reason. Just wondering is this normal behavior of motherboard or this is a bug.
I often render 3D graphics, CPU temp is up to 73°C. Don't know how Low Noise adapter will affect the CPU temperature and clock.
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post #4 of 44 (permalink) Old 07-29-2020, 11:02 AM
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Quote: Originally Posted by DenisL View Post
Thanks for the answer!
I suspected that the motherboard is the reason. Just wondering is this normal behavior of motherboard or this is a bug.
I often render 3D graphics, CPU temp is up to 73°C. Don't know how Low Noise adapter will affect the CPU temperature and clock.
Depends on what fan speed is at 73c when rendering. LNAs' lower speed about 20% if I remember correctly, so 1200rpm becomes 960rpm, 1500rpm becomes about 1200rpm

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post #5 of 44 (permalink) Old 07-29-2020, 11:04 AM
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Quote: Originally Posted by DenisL View Post
Hi!
When I launch my PC it is very loud for several seconds. It is Noctua NH-D15 and it connected to CPU_FAN and CPU_OPT 4 pin connectors on Gigabyte X570 Aorus Elite motherboard. Both fans work in PWM control mode. BIOS version is F11.

Is this normal or can it be fixed some way?

Video (with sound):
https://www.youtube.com/watch?v=lA1Aw0_kU9U

AMD Ryzen 9 3900X
Noctua NH-D15
Gigabyte X570 Aorus Elite (bios F11)

This lasts since I built this PC and now I'm tired of this sound a little. Also, it can wake up my wife.
This is normal. The Z390 Aorus master does this too.
It also spins up the fan during BIOS flashes, and will spin up a fan to 100% after a BIOS flash is complete, or after a clear CMOS when the system is re-training.
Nothing you can do about it.

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post #6 of 44 (permalink) Old 07-29-2020, 11:17 AM - Thread Starter
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doyll, Falkentyne, thank you very much for answers.
Guess I need to accept this.
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post #7 of 44 (permalink) Old 07-29-2020, 11:29 AM
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surprisingly loud at full speed but quite normal when you start up the computer
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post #8 of 44 (permalink) Old 07-30-2020, 06:42 AM
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Totally normal.
I also think that's the GPU fan not noctua. I have gigabyte X570 itx board and it's also loud at startup but it's actually come from GPU not CPU fan.
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post #9 of 44 (permalink) Old 07-30-2020, 08:52 AM - Thread Starter
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Quote: Originally Posted by NonXtreme View Post
Totally normal.
I also think that's the GPU fan not noctua. I have gigabyte X570 itx board and it's also loud at startup but it's actually come from GPU not CPU fan.
I'm sure this is Noctua. Checked it now again 2 times.
GPU here is MSI RTX 2060 Super Gaming X. After launch, its fans spin with constant speed and stop after about 30 seconds ("Zero Frozr" function).

Wondering why on some motherboards fans stay silent at startup but on others, they spin to 100% and roar like here.
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post #10 of 44 (permalink) Old 07-30-2020, 09:01 AM
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Try a different fan header. Or look into a cheap fan controller, like a Quadro.

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