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.
Power draw is not even 10W higher than the Founders Edition, with just a 2W difference between BIOS 1 and BIOS 2. Bearing in mind that the Palit WGRP does run faster than the Founders Edition, that is a pretty good result.