Question Gigabyte GP-P750GM making weird sounds when under load

[Makka89]

Hello! My new Gigabyte GP-P750GM making weird sounds when under load. I have tried it with a game and when i alt+tab to desktop the noise stops, but when back to the game it is start to doing it again.
All the parts are new except the Video card(tested and there was no problem on old configuration except little coil whine from it)

Link of the video : PSU Noise
My specs are:
Motherboard: ASRock B550 Phantom Gaming 4 ATX AM4
CPU: AMD Ryzen 5 3600
GPU: Asus Radeon RX 470 4 GB STRIX
SSD: 2x - ADATA XPG SX8200 Pro 512 GB M.2-2280 NVME
HDD: Seagate BarraCuda 1 TB 3.5" 7200RPM
Memory: Patriot Viper Steel 16 GB

The other strange thing is that my HDD doing a strange high frequency buzzing noise. At few centimeters i can hear it clearly but when i am far from the pc case i don't hear it that much but my ears shrill.
And i still can hear this high frequency buzzing noise even after the pc is turn off from long time.

 

[Makka89]

Bump.
I have test it with 8+4 and only 8 pins for the CPU cpu power connectors.

Video:
https://streamable.com/mbcah4 - GPU stress test, 8+4 pin cpu power connectors plugged in the mainboard.

https://streamable.com/o6h0wx - Idle condition (the most annoying thing i've ever heard) , 8 pin cpu power connector plugged in the mainboard.

https://streamable.com/mo4egf - GPU stress test, 8 pin cpu power connector plugged in the mainboard.

 

[Mmazulis]

I got this same psu, mine is with annoying coil whine but not as loud as yours, I’m thinking about connecting the +4 pin to the cpu on the mobo to see if something changes... what do u think.?

i’m running a 5700xt and a 5600x