Question Whining sounds under low load - Deepcool PX850G

[Python311]

[Moderator Note: moved from Motherboards to Power Supplies per OP request.]

Hello everyone. I got a new PC with the specs:

PSU: Deepcool PX850G 850W
Motherboard: Asus TUF GAMING B650M-PLUS (WIFI)
CPU: AMD Ryzen 5 7600
CPU AIO Cooling: EKWB EK-Nucleus AIO CR240 Dark
GPU: GTX 1050ti

When my PC is idling the PSU or Motherboard VRM (most probably) makes high pitched sounds/whining. I have three videos:

1.

View: https://youtu.be/DnslTQSWsbo
- demonstration of the noise itself, when it happens and when it disappears
2.

View: https://youtu.be/ngeRs-uNNTk
- I'm showing the power consumption drop on the wattmeter (in Idle it's ~78W and after mouse movement it's 94W)
3.

View: https://youtu.be/qTdtJ7RfTFI?si=q6dvcKR4SiUznoS7
- the video with the disconnected GPU. When stressing the CPU the sound goes off completely.

All the measurements were taken with the connected BenQ monitor which was consuming approx. 20W, so idle consumption is 60W and under lowest load it's ~80W

So, the problem is that my Motherboard's VRM and possibly PSU starts whining, when the power consumption is dropped from 80W to 60W and I need some help. I found some options under UEFI section "DIGI+VRM" that may help but I don't know what exactly would work (hopefully not returning parts to the shop).

This whining is absent when I'm not in textual/terminal mode, but when I do something solely text related the sound is just painful.

 

[scout_03]

stress test psu using occt also you have watercooling press on of the tube to see if sound goes on and of use hwinfo to check temp voltages and fans speed on test it could made a log of it .

 

[Python311]

stress test psu using occt also you have watercooling press on of the tube to see if sound goes on and of use hwinfo to check temp voltages and fans speed on test it could made a log of it .

Under heavy load no whining at all.
When I'm pressing onto the tube while it whines - nothing happens and whining is the same.
Fan speed is the lowest possible and temps are lowest, checked through s-tui.

 

[Python311]

OK, so that's the PSU 100%, I disassembled the Pc and separated PSU and motherboard, and it's definitely a fail of the PSU.

 

[Python311]

OK, so that's the PSU 100%, I disassembled the Pc and separated PSU and motherboard, and it's definitely a fail of the PSU.

Video with that

View: https://youtu.be/MZxrpfxnYrk?si=EzXTGw50cOy2su5w

 

[Python311]

I issued an RMA due to inability to fix this in the intended way.

One solution was to write some driver/daemon code to load one of the cores so that the power consumption is at least 80W and another was to create a mechanical device to constantly draw current from the PSU, something like resistor into molex.

Obviously these options are dumb so I'd be looking for any other PSU and hope that it won't whine while I am performing my tasks like text editing without any load neither on the cpu nor gpu