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My trust Corsair RM850x is a very well rated power supply, so i'd be surprised if it was causing any issues, but you never know. Thanks for raising it. It had never even crossed my mind that PSUs can affect coil whine.
No worries, definitely something to consider/research, especially as my brother with a 6800 non-XT also recently swapped PSU (to the same as yours, albeit the ATX3.1 model like mine) and experienced the exact same behaviour with coil whine.
 
My Palit 1080 Ti also had none.

Slightly off topic but my 6800 XT had lots of coil whine with an EVGA 850w PSU that was 6+ years old, which worsened as time went on.

I bought an RM1000X to replace it when the warranty ran out and now I have minimal if not zero coil whine! The source of it was definitely the card too, a pleasant surprise.
I had a similar problem on my 3090 and coil whine with an evga psu, changed for a corsair 1200w which resolved the problem
 
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