We measured the power consumption with the system resting at the Windows 7 desktop, representing idle values.
The power consumption of our entire test system is measured at the wall while loading only the CPU using Prime95's Small FFTs setting. The rest of the system's components were operating in their idle states, hence the increased power consumption values (in comparison to the idle figures) are largely related to the load on the CPU and motherboard power delivery components.
As is the case with Asus' other ROG boards that we have tested, the Maximus VI Formula shows good efficiency when loaded at stock speeds. Idle power consumption figures are slightly higher than some competing boards, such as ASRock's Z87 OC Formula.