Non-gaming power consumption is increased a bit over the AMD reference design. With 4–5 W more, it's not as dramatic as it looks in these charts. Like on all other Navi cards, multi-monitor power consumption is still too high when compared to competing NVIDIA cards.
Gaming power consumption is surprisingly high. With almost 300 W, it is about 60 W (or 25%) higher than on the AMD reference. You do get some performance back due to the OC out of the box, but this increase not only increases your power bill, but also hurts noise and temperatures because the cooler has to get rid of the excess heat.
Recommended PSU: 650 W