I got evga supernova 850w, on the box it says 'silent series' lols, the fan doesnt start to spin till it get 50c or over something like that, i can never hear the fan its all great, but the electricity sound is bugging me a bit, its more noticeble when surfing the web.
I just tested a game on max settings to draw more power from psu, the electricity sound changed and it was less noticable.
Basically its annoying only when surfing the web ect. coz in silent condition its the loudest thing in the room and a bit annoying idk if they're all like this or this particular one i got is this way.