We first measure system-wide power draw from the wall while the card is sat idling at the Windows 10 desktop for 5 minutes. Gaming power draw is recorded by running the Deus Ex benchmark at 4K. As a maximum stress test, Fire Strike Ultra Stress Test is run 5 consecutive times and the cards’ power draws are recorded.
Surprisingly, the Strix card is actually marginally less power-hungry than the MSI Gaming 8G. I would've though the extra 76MHz might have bumped the power draw a little, but the Strix design is obviously very efficient.