Power ConsumptionThe energy efficiency of the Ryzen 7 1800X is a minor miracle by AMD's standards considering how inefficient the FX "Piledriver" series was. Ryzen even makes Intel look bad.
It's amazing what AMD has done with its chip. The SenseMi power-management system seems to be working well in idle, with the 8-core machine drawing the same amount of power as Intel's quad-core "Kaby Lake" machine. Overclocking doesn't affect power draw in idle since the CPU's power-management spools down clocks when idling.
The power draw of the Ryzen-powered machine is slightly less than that of Intel, but SuperPi is a single-threaded workload, and the Intel i7-7700K is yielding more performance here, so the Intel chip is more efficient in this scenario.
At stock speeds, the energy-efficiency of Ryzen is truly phenomenal. Prime95 loads all cores and threads on the chip, and the Ryzen ends up with as much power draw as the quad-core Intel i7-7700K. The high power draw result of the overclocked chip is due to the increased voltage needed to achieve stable operation.
This is epic. We're assuming you've sifted through our game-test results before seeing this page, and so you'll find that the gaming power draw of the 8-core Ryzen makes Intel's quad-core i7-7700K look bad. Power draw is as much as 30W lesser!
Ryzen is hands down the most energy-efficient performance CPU AMD ever made, and easily outclasses Intel's 14 nm "leadership." Good show.