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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 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.