I also noticed during some testing at the third PSU, that when only MOBO is connected
there is absolutely no buzzing or whinning. Only silence.
When I connect the rail with BluRay and SSD disk on it, PSU starts make these sounds.
I would crosscheck that either of those are not the source of the whining, some ssds can whine, but its not very likely, i still think its the PSU, but its better to crosscheck.
I am already pissed off. I did not expect such issues with the PSUs for about 175 USD. It costs me valuable time.
It would be great if you could list all the hardware you using, maybe you could get by with a little less power, with something like,Kingwin Striker STR500
reviewed by SPCR Fanless PSUs: Kingwin Stryker STR-500 & Silverstone ST50NFRosewill SilentNight 500
reviewed by SPCR Rosewill Silent Night 500 Platinum 80 Plus
Would you know some alternative PSU around 650W with hybrid/silent mode and modular cables? Another brand. Not Seasonic.
If you truly need 650W, then imo the best alternative to Seasonic X series is Kingwin LZP Series. also has hybrid fan that will turn off based on tempertaure, the 550 version was reviewed by SPCR, Kingwin Lazer Platinum 550W Power Supply
. There are higher wattage version of the LZPs, including one that maches your 650W desire, KINGWIN LZP-650 650W ATX 12V v2.2 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS PLATINUM Certified Modular Active PFC Power Supply