Power supply
The problem I understand with the fan,try to clean and grease,in a pinch to replaceLeHaMvP007
https://www.nix.ru/autocatalog/cables/Akasa-AK-CBFA05-05-Ballastnyj-rezistor-dlya-upravleniya-skorostyu-vrashheniya-ventilyatora_379318.html
One thing that slows by 20% and then he will count. I tried 2, but one was from Noctua WORKS.
I advise you to take a few, suddenly a little will.
You can also take the less resourceful turntable. Zalman for example. Not above 1400-1600 rpm (relatively very quiet at these speeds 120-CI).
Look at the secondary. there are good suggestions for cheap -complete.
You were lucky that the valve at Besnica - 120mm
This https://belgorod.nix.ru/autocatalog/zalman/coolers/ZALMAN-ZM-F3-SF-Fan-for-m-tower-3pin-120x120x25mm-20-23dB-1200-ob-min_192909.html
If the PSU is cold.
This https://belgorod.nix.ru/autocatalog/arctic_cooling/Arctic-F12-3pin-120x120x25mm-244dB-1350ob-min_95773.html
If teplenky.
This https://belgorod.nix.ru/autocatalog/coolers_be_quiet/be-quiet-BL046-Pure-Wings-2-3pin-120x120x25mm-192dB-1500ob-min_342584.html
If it is warm.
And if very warm then https://belgorod.nix.ru/autocatalog/coolermaster/Cooler-Master-R4-L2R-20AC-GP-Long-life-LED-Fan-3pin-Blue-LED-120x120x25mm-19dB-2000ob-min_78759.html
LeHaMvP007
On my old PSU it was such garbage.I opened it, cleaned from dust, and the noise diminished.
I have the same unit on one of the computers, the second year running and no noise. if nothing overheats, then the problem is with the fan. disassemble the unit, take off the fan and plug it separately at 12 volts, then listen to the sound and see how it all turns. in extreme cases the fan can be changed is a question of two or three hundred rubles.
legusor
It is not clear just what manufacturer does that,BP cold like from the refrigerator loads and revs it like it's hot...