Thanks for the tip!Use the cardboard tube from a roll of paper towels like a stethoscope to locate exactly where it is coming from.
I had this squeeking coils issue but only in one use case: when using madVR video renderer. Normally GPU utilization is near 0% and in games it is 100% but in madVR it is somewhere in the middle with card most probably having peak utilization for a moment and then going idle 24/25/30 times a second.Thanks for the tip!
I used a mouse pad instead of toilet paper roll, and it seems to be coming from the PSU! Since this is a different PSU from my old PC, this noise problem is likely unrelated to my mouse Hz problem.