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).
Power consumption tests is the star moment for the Intel DZ77BH-55K mainboard, because it is extremely energy-efficient not only in idle mode, but also under any type of operational load. I have to say that unlike its “Extreme” sisters, Intel DZ77BH-55K had all processor power-saving technologies working correctly right from the start – in idle mode the processor clock frequency multiplier, as well as its Vcore, were dropping as they should. However, the VR Status LEDs that should indicate the number of active phases in the processor voltage regulator circuitry always had four lights blinking. It means that either the indication system is not working or the dynamic phase adjustment technology is non-operational on this board. We tend to believe the latter is most likely the case, because the board’s power consumption readings didn’t change at all when we changed the “Processor Power Efficiency Policy” parameter. So, in fact, this board could have been even more energy-efficient, if this technology had worked properly.
During processor and memory overclocking Intel DZ77BH-55K mainboard remains one of the most energy-efficient testing participants. Only those products, which failed to overclock the CPU as far as Intel DZ77BH-55K are a little ahead, since their Vcore didn’t rise as high as on Intel DZ77BH-55K. So, it’s a false win for them here.