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 for 30 minutes.
Lastly, we look at total system power consumption. Here we saw a difference of 20W between the two BIOS options, with the Silent BIOS offering slightly better overall efficiency which in turn helps its thermal results as we saw earlier. Still, for a slightly factory overclocked 5700 XT, both sets of results are pretty much as expected.