We performed our power consumption measurements using the same 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. The power consumption in case of single-threaded CPU load is measured while running the Pi-digits performance test, and in case of multi-threaded load – while running the Fritz Chess Benchmark test. We also used Hitman Absolution game to create complex load. The results on the diagrams are sorted out in ascending order and the results of Asus P8Z77-V LE PLUS are highlighted with darker color for your convenience.
Unlike the other entry-level mainboards from ASUS, the P8Z77-V LE PLUS is not very economical. Even though Intel’s CPU-related power-saving technologies are enabled on it by default, it needs quite a lot of power. Yes, it need much less than the flagship models from ASRock and ASUS but their power requirements are not typical of ordinary products because they have an additional PCI Express switch.
You can try to make it more economical, both at high loads and in idle mode, by enabling EPU Power Saving mode in the BIOS or with the onboard switch.
Now let’s compare how much power the systems need when overclocked.
The P8Z77-V LE PLUS was comparable in power consumption to the other ordinary mainboards at the default settings, but it is the least economical among them at the overclocked settings (with the exception of the two special models). That’s a shame as an entry-level product can be expected to require little power.