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.
As for power draw, I was slightly surprised to see this Gaming OC pull less power than the Founders Edition, but the margin proved to be just 2W so definitely within margin of error for a system-wide power consumption test. In any case, it's basically the same as the other 2070 SUPERs, with all three cards pulling with 10W of each other.
Be sure to check out our sponsors store EKWB here