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Hope it works for you
The bios switch reduces power use even more. So if it's restarting in both modes, its definitely not overloading your PSU. Could be something wrong with one of the cables going into the card.
Have you tried the card in another PCIe slot? Might be worth doing if you are having problems after installing the new PSU.
B350-MA has single PCI-E slot... was only board I could get when Ryzen came out, The other odd thing is it was fine with an overclocked 1080ti, but power use even in low power mode isn't comparable!