***Moved from service inquries. MUST have existing RMA to post there***
Hi Bostjan,
Coil whine is not typically considered a defect by manufacturers, whether that be motherboard or GPU. It's just the nature of hardware. It's likely that any unit of that model will behave the same way in the same environment. I don't work for ASUS but I don't think coil whine is a valid reason. I doubt an RMA would help anyway because that would replace it with the same thing.
If it's related to a USB device I would try a different USB port. If you already tried a different _model_ of PSU then it's too bad that didn't work. That would have been my first suggestion.
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