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FRodrig
Journeyman III

High Pitch Buzzing Noise From Ryzen 9 7900X CPU?

I've been having this issue for months after building my new pc where I keep dealing with an annoying electrical buzzing sound that I hear where my cpu is. The noise stops when I'm in my bios, but when I boot up windows it starts. It randomly starts and stops once in windows, but I noticed I can sometimes get it to stop when I move my mouse around. Going into power saving mode in windows mitigates but doesn't eliminate it and when I begin gaming interestingly the noise reduces significantly to where I can't hear it unless I press my ear against where my cpu is. At first I thought it was from my PSU so I changed it twice only for the issue to persist. Then I thought it was my motherboard, so I switched to a different brand and model, but still the noise continues. It isn't caused by my gpu as even when its removed the noise goes on, and the cpu fan isn't causing it as I unplugged it for a few seconds and I still heard the noise. Has anyone with this cpu had these issues? Anyone know what could cause this and how to fix it? Or is it just a fauly cpu I received?

CPU: Ryzen 9 7900X

Mobo: Asus Rog Strix B650E-F

RAM: 32GB Corsair Vengeance

GPU: RX 7900 XT

PSU: Seasonic Focus 1000W Gold

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1 Solution
AndreX86
Journeyman III

It's the turbo boost. Disable core boost in your BIOS and it'll go away. In other words, you have to run the CPU at its base frequency. This has been an issue for both Intel and AMD when boosting is enabled. I'm guessing it has to do with the fluctuating voltages going through the different cores. Anyway, i have a 7950X3D and disabling Core Boosting is the only way I could get rid of the whine. 

View solution in original post

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10 Replies
johnnyenglish
Big Boss

Hi,
That would be VRM Coil Whine. Its pretty normal.

There are some ways to solve it but lowers the efficiency of VRM at lighter states.
I can't hear it unless I take off the side panel get really near the VRM's.

7900X and 7950X will be the worst offenders as they need a lot of juice.



"You hear is because the VRM switches it's FET's on and off at a very high frequency...usually in the 200-300Khz range...so very high currents are being turned off and on at that rate. That can make the coils vibrate at a sub-multiple of that frequency, something in the audible range. It's kind of like the same way a voice coil on a speaker works. Changing the frequency might push the vibration into an in-audible range or into a range where the coils don't resonate.

The BIOS setting might also change the phase duty cycle...or how many of the phases are being used during light current loading. Turning on more phases during light loading means each phase is passing a much lighter current at a time and so there's less energy to vibrate its coil even though more energy over-all is being used.

The side effect of each of these mitigations is lowered efficiency of the VRM during lightly loaded conditions"

The Englishman
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Are there options to at least mitigate the sounds? I've been worried that these sounds are signs of a faulty CPU I received and the coil whine is VERY noticeable and annoying at times.

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Yes, its in my reply how you can mitigate but it will affect VRM efficiency.

To be clear, I've never heard of a CPU doing such sound.

The common offenders regarding coil whine is:

GPU, this is fairly common, almost every GPU does it under heavy load.
PSU, when they go beyond peak efficiency and/or are not able to maintain system load, they will whine.
VRM, not that common before Intel 13th gen and 170TDP Ryzens

If you wish to troubleshoot this, turn on ECOMODE 65 and leave everything else at auto, remove curve optimizers, EXPO and such. take off the panel and listen carefully the origin of the sound.

Examples of VRM Coil Whine

https://www.youtube.com/shorts/B4lRtAY9n88

https://www.youtube.com/shorts/Hs3rHriD9ZA

 

 

The Englishman
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That second video is very similar to what I hear. I'll have to start tinkering in the bios then to see if anything works.

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Are you using both 8 & 4 pin cpu cables/connectors to the motherboard, might be something to check with asus support/forum?

Ryzen 5 5600x, B550 aorus pro ac, Hyper 212 black, 2 x 16gb F4-3600c16dgtzn kit, NM790 2TB, Nitro+RX6900XT, RM850, Win.10 Pro., LC27G55T..
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AndreX86
Journeyman III

It's the turbo boost. Disable core boost in your BIOS and it'll go away. In other words, you have to run the CPU at its base frequency. This has been an issue for both Intel and AMD when boosting is enabled. I'm guessing it has to do with the fluctuating voltages going through the different cores. Anyway, i have a 7950X3D and disabling Core Boosting is the only way I could get rid of the whine. 

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Hmm, Ill give this a try and see if it works. Thanks.

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I've disabled core boost in the bios and although it didn't eliminate the noise completely, it made it much lower and bearable. Still annoying that I can't get rid of it completely but I can tolerate this better than before. Thanks.

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dariuszpawlak85
Journeyman III

I built my set on GIGABYTE B650 GAMING X AX, rev, 1.0 + RYZEN 9 7900x

in this set the coils were audible
on Saturday I replaced the motherboard with ASUS TUF GAMING X670E-PLUS WIFI and now I checked, I no longer have this noise

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Im still having the same problem with my TUF gaming MB and wondering? Does that effect performance at all? Like games crashing? BTW im new here 

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