To measure power consumption we use a killawatt meter and measure the total system power draw at the wall. We run three different use-case scenarios for 5 minutes and take the average reading.
Power consumption has never been AMD’s Forté and that shows here. At stock speeds the Crossblade Ranger system pulls slightly more than an i7 4770K Z97 system which delivers more performance (but costs a heck of a lot more!). At load the power consumption balances out more and Steamroller actually looks fairly efficient, Intel are still miles ahead but the gap isn’t bad, especially considering the price and the unfair comparison here.