Gigabyte P650B 650W 80+ Bronze. I have been using it for 3 years with an Xeon X5450 with 120W tdp and R9 280X(which draws 250W).By this time, the RX 6000 series' drivers have matured. You just need to make sure you have a beefy PSU since the card can be known to draw more power in certain scenarios much like RTX3000 series transient load spikes.
Make and model of the PSU you're working with?