No worries, I was also sleeping not too long after having made that post.
The higher the framerate, the more your inductors will oscillate and TLDR you'll get mad coil whine.
Personally I use RivaTunerStatisticsServer to both monitor temperatures/framerate as well as limit FPS.
And for what it's worth, you should absolutely be using VSync on damn near everything anyway, chances are your monitor is 60hz meaning your monitor can only display 60FPS, any extra frames are just wasted electric (who needs to be wasting that these days)
Oh and I'll reiterate, coil whine is totally normal and you needn't worry, it's annoying of course but there's nothing that can be done about it, best to just lock VSync (or use a framerate limiter) and try ignore it.