Got a 1080 FTW a few days ago that buzzes like crazy under load. I don't have a recording but it's identical sounding to this guy's card https://www.youtube.com/watch?v=yF5sx7HXuSY
. I exchanged 4 980ti's for the same problem (mix of Gigabyte and EVGA cards). Never found a good one just decided to live with it.
I've tried different power supplies (currently running an EVGA 850P2), bought a power conditioner to make sure it wasn't crappy wiring in my house, and even switched motherboards. Changed clock speeds, ran stress tests overnight, capped FPS at 60 blah blah all the stuff people suggest. I honestly can't believe it. I NEVER had a problem like this until the 9xx series cards.
So damn annoying. Guess I'll try MSI next?