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.
Power consumption was also recorded while playing Battlefield 3, representing gaming values.
Although we measure the power consumption of our entire system, analysing the stock-clocked P8Z77-V LK and P8Z77-V motherboards’ power consumption figures, we can make accurate estimations as to the difference in power consumption between each board.
The Asus P8Z77-V LK motherboard appears to require 9W less power than the P8Z77-V. This reduced consumption is related to the P8Z77-V LK’s fewer onboard controllers, in comparison to the P8Z77-V.