We measure system-wide power draw from the wall while the card is sat idling at the Windows 10 desktop for 30 minutes. A reading under load comes from running the 3DMark Fire Strike Ultra stress test 20 times.
Our power testing did not present any surprises, with the Pulse card drawing 3W more than the reference card based on our testing. That makes it an effective tie, as practically speaking that extra 3W is just not going to make a difference in the real world.