It's commonly called coil whine. You might want to tweak BIOS and try to disable C-states or such power saving features of the processor. The main problem is a physical problem in your motherboard. Having linux can change the sound but won't fix this issue. Only real fix I see is to get a new mb eventually. But if Linux reduces it, go for it!

https://randompctips.blogspot.com/2021/04/how-to-get-rid-of-coil-whine-by.html

https://en.wikipedia.org/wiki/Electromagnetically_induced_acoustic_noise

This happened to me aswell. On windows I've had some significant coilwine and since switching to Cachy I haven't heard a single buzz from my case

Piezoelectric? Do you have a printer in your PC? 😄

Regardless, score for Linux, I guess. Gould be ale to game just fine, as long as it isn't using crappy anticheat.

Could be that Windows is more-aggressively kicking the hardware into low-power mode or that the graphical environment is using the hardware to do more desktop rendering stuff.

Wrong community. This community is about Linux, not Windows.

I would imagine it's due to windows using more power saving modes that cause the coil whine when active, but if linux solves it then might as well keep using it!

I had the same issue years ago when i still used windows 10 on old pc. But, unlike in your case, where buzz was coming out of case, for me, it was also caused by the mouse movement, but the buzz was coming out of speakers, so turning off speakers, muted the buzz. I dont know what exactly, but it was propably something with windows assuming mouse movement being an aux input. It was never a problem since i switched to linux.