Question Coil Whine on the VRM when TDP spikes up and down

[XXTechnologistXX29]

Hello,
I have recently built a computer (well, two if you count all the pieces I've replaced) and it seems to be cursed with coil whine.
My specs:

• 10850K
• Noctua NH-D15
• MSI Z490 Gaming Edge (previously ASUS TUF Z490)
• Seasonic Focus GX 750W (I have used a Sharkoon SilentStorm Cool Zero that my friend gave me but the issue is still there)
• TD500 Mesh
• Nvidia GT 710 (previously the iGPU)
• 1 cheap Corsair fan
• 32GB 3200Mhz Corsair LPX with 16 as latency

Things to note:

• the coil whine is present in the VRM section of the motherboard, next to the CPU;
• changed the motherboard and the coil whine persists;
• changed the Seasonic with the Sharkoon, the latter was causing higher coil whine;
• when there is coil whine, some light horizontal moving grey lines start to appear on the monitor, tried with 2 TVs too and the lines are always there.

When the coil happens? The coil happens when I run Intel XTU in benchmark mode or Prime95 in benchmark mode, sometimes it happens randomly when browsing (the fan starts spinning for 2 seconds faster, indicating that maybe the CPU has a temporary higher load)
AIDA64 Benchmark/Intel XTU single stress testes/Prime95 Torture test don't cause any coil whine.

After fiddling around for more than 3 WEEKS, I managed to find "how" it happens drumroll: it happens when the CPU quickly goes up and down from 15Watts of energy to 150+ Watts of energy.

Can anyone tell me what is wrong or a way to fix this?

 

[Myst_8362]

It could be ur psu(s) are faulty and your cooler is faulty idk
but u
its a Noctua so I highly doubt it

 

[Flayed]

I'm not sure there is really much you can do about coil whine, it happens sometimes with VRMs, power supplies and graphics cards. It is not exactly a fault as such.

 

[helper800]

I'm not sure there is really much you can do about coil whine, it happens sometimes with VRMs, power supplies and graphics cards. It is not exactly a fault as such.

Read the part on the bottom, there is something going on.

• when there is coil whine, some light horizontal moving grey lines start to appear on the monitor, tried with 2 TVs too and the lines are always there.

When the coil happens? The coil happens when I run Intel XTU in benchmark mode or Prime95 in benchmark mode, sometimes it happens randomly when browsing (the fan starts spinning for 2 seconds faster, indicating that maybe the CPU has a temporary higher load)
AIDA64 Benchmark/Intel XTU single stress testes/Prime95 Torture test don't cause any coil whine.

After fiddling around for more than 3 WEEKS, I managed to find "how" it happens drumroll: it happens when the CPU quickly goes up and down from 15Watts of energy to 150+ Watts of energy.

Can anyone tell me what is wrong or a way to fix this?

 

[XXTechnologistXX29]

It's not the monitor because I tested my PC with two different TVs and the grey lines still show, and plugged an external laptop which doesn't show any grey lines.

Here's a video of the grey lines, they get more noticeable when the coil whine gets higher:

https://drive.google.com/file/d/1FSmvQL4f9gTblOrZi5MQDMP7wcpyJop-/view?usp=drivesdk

If it may help, I have disabled turbo boost and the coil whine was 40% less noticeable, the grey line were less but still noticeable.

When disabling turbo boost the TDP using Intel XTU Benchmark went from 10-200W to 10-90W and the Core Voltage went from 1,165-1,300 to 0,985-1,050.

Hope these info may help..Thanks.