Whatever its rating, if the PSU is doing the high frequency shuffle then it's time to try another one. That sound could be a failing cap or one that just isn't up to the load.
For test purposes, do you have another supply (whatever size) you could cobble up next to the case to run just the card? Even another PC sitting next to it. Remove the other pc's storage power & let the MB idle while it powers the other machine's video card.
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