We performed our power consumption measurements using an Extech Power Analyzer 380803. This device is connected before the PSU and measures the power draw of the entire system (without the monitor), including the power loss that occurs in the PSU itself. In the idle mode we start the system up and wait until it stops accessing the hard disk. Then we use LinX to load the CPU. For a more illustrative picture there are graphs that show how the computer power consumption grows up depending on the number of active execution threads in LinX (both at the default and overclocked system settings).
Unfortunately, numerous onboard controllers do affect the power consumption of the ASRock Fatal1ty Z77 Professional mainboard. It is obviously higher than average, even closer to the maximum, but it is still lower than the power consumption of the Gigabyte board, which has a power-hungry PCI-E hub. All processor power-saving technologies work absolutely correctly on the ASRock mainboard right from the start, but you can only noticeably reduce the power consumption under any type of workload or in idle mode if you enable “Power Saving Mode” in the mainboard BIOS.
During overclocking the situation with power consumption doesn’t change. ASRock Fatal1ty Z77 Professional is among the other boards that consume more power than average, like Asus P8Z77-V Deluxe and Gigabyte G1.Sniper 3.