I built a new system a couple weeks ago and have been a little surprised by how loud the PSU buzzes while idling, to the point it's pretty audible when doing stuff behind the computer like unplugging things from my UPS. I wear headphones most of the time when I'm at my desk so I'm not fussed about the noise itself, but I thought maybe I should double check here and make sure it isn't anything I should be alarmed about. The back of the unit does get pretty warm/borderline hot to the touch after extended sessions under load, not enough to actually burn obviously, but I know these silent fan units can idle pretty high without the fans kicking on. For reference this system has a 10700k CPU running at stock clock, 3070, 16GB RAM, and five ~1.56W case fans so I'd think everything's well in line with the PSU's capabilities. Disregard the clicking sound, that would be my extremely loud Western Digital hard drive.
Sound while idling
Sound while under load
Sorry for vocaroo links, but I don't know a better site for hosting small audio clips.