So my Corsair RM1000i has, AFAIK, Started to develop coil whine, Only started around 1 month ago, Not noticeable during the day but when it gets quiet at night any movement with the mouse, Scrolling pages etc... and I can hear it albeit very faintly, I thought it was the GPU at first so I unplugged my 1080 Ti and used the 9900K's iGPU, Same exact sound.
This is what it sounds like, Amplified a little to make it more obvious, Sounds like a tiny cricket or grass hopper even when just sat at the desktop doing nothing but moving the mouse cursor, If there is zero onscreen activity there is no sound but even on the iGPU as soon as there is any onscreen activity I hear it.
Cause for concern ?