The drastic approach: finding the culprit and replace it. Years ago I had a combination of MB and PSU that produced an annoying whine. Putting a different PSU m

The drastic approach: finding the culprit and replace it. Years ago I had a combination of MB and PSU that produced an annoying whine. Putting a different PSU model eliminated the noise. Sometimes it's the combination of GPU and PSU, YMMV. The thinkerer approach: find the noisy coil and bury it with a generous amount of hot glue or some other similar dielectric material. You are trying to reduce the coil "vibrations" and dampening the noise. Personal anecdote, both mine and my sister's Dell XPS 13" (9333 model) have an annoying coil whine that is really evident on quiet rooms, in a normal office environment I can't hear them tho. From what I've read online recent XPS models still have that defect. Baffling, a lower specs Latitude 15" that was provided to me in a previous job didn't had any. In my case an user has solved the issue disconnecting the audio speakers, don't recall if it was one of them or both, if someone is interested the post is somewhere in the Dell support forum.