I haven't measured power consumption with a meter, but each CPU has a TDP of 155 W, so potentially 620 W plus whatever is required to keep the motherboard, RAM, and disks alive. My ballpark guess is 750 W at full load and under 200 W at idle. It runs off a 1600 W power supply, but I suspect that is overkill. It's definitely less power-efficient than a new Ryzen CPU.