Yeah, my NAS uses something like 50W (measured from the wall), with two HDDs, a SATA SSD, Ryzen 1700, and an old GPU (750 Ti, won't boot without graphics). I haven't measured everything independently, but online sources say 6W for the GPU. So the A380 would be 3x higher. That doesn't matter too much in my area, but it's still extra power draw.

Hopefully the new gen is close to that 6W figure.