Hello everyone, I have the same issue here.
Everytime my frame rate is changing, the buzz comes back and depending on how I move my mouse in the game (Up or down) it gives me a different buzz noises (pitched up and down), so I think it is definitely coming from the GPU.
I did the Realtime Off solution so now, it’s not buzzing all the time. And I changed my speakers connections cables from Jack Balanced to XLR balanced and it helped to reduce the amplitude of the signal, but I still couldn’t find the issue and fix it completely.
I’m on WINDOWS 10 - 4060 GPU.
Btw, I never had the issue when using UE5 on MacStudio.
Best,