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 Gigabyte GA-Z77-D3H are highlighted with darker color for your convenience.
As we wrote above, the Gigabyte GA-Z77-D3H correctly enables all CPU-related power-saving technologies by default. You don’t have to do any manual setting-up for that, which is an advantage. However, the power consumption level of this mainboard is higher than that of the ASUS P8Z77-V LK and MSI Z77 MPOWER which have similar capabilities. The Gigabyte needs much less power 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.
Now let’s compare how much power the systems need when overclocked.
The standings do not change. The Gigabyte GA-Z77-D3H expectedly needs less power than the two special models but its power draw is higher compared to the two other ordinary mainboards.