For testing power consumption, we took our test system and plugged it into a Kill-A-Watt power meter. For idle numbers, we allowed the system to idle on the desktop for 15 minutes and took the reading. For load numbers we ran Battlefield 4 at 3840×2160 and recorded the average idle reading and the peak gaming reading on the power meter.
Power Consumption Results: The power draw with the Sapphire Nitro RX 480 4GB installed in our test system had everything topping out 352 Watts when running BF4 at 4K resolutions. The idle power was actually a bit better than the reference card!