At that Platinum-660 (SS-660XP2 Active PFC F3) there was almost noticable buzzing sound, it sounds only like the electricity goes inside the PSU from the socket and circulate there, so I kept this one. Seasonic should really start to work on this issue, because I am not only one with these problems....

Hello, I had already four Seasonic PSUs. I started with X-760 (SS-760KM Active PFC F3) and after that I had three X-650 (SS-650KM3 Active PFC F3). All of them were more or less buzzing during the PC run and after the PC was turned off. So I returned them. Now I put an order for new Platinum-660 (SS-...