We measured power consumption using Extech Power Analyzer 380803 device. This device was connected before the system PSU, i.e. it measured the power consumption of the entire system without the monitor, including the power losses that occur in the PSU itself. When we took the power readings in idle mode, the system was completely idle: there were even no requests sent to the hard drive at that time. We used LinX program to load the CPU. For more illustrative picture we created graphs showing the power consumption growth depending on the increase in CPU utilization as the number of active computational threads in LinX changed in nominal mode as well as during overclocking. The boards are sorted out in alphabetical order on the diagrams below.
The full-size ASUS P7H57D-V EVO consumes much more power than the rest of the mainboards, but it is a unique, maximum-functionality LGA1156 mainboard and this might be expected from it. ASUS P7H55D-M EVO and EVGA H55 are not economical when idle both in nominal and overclocked modes (the EVGA board seems to consume little power when overclocked only because it is not overclocked as much as the other mainboards). The rest of the mainboards are close to each other in terms of power consumption. We can only note that Intel DH55TC and MSI H57M-ED65 are somewhat more economical than their opponents in the nominal mode.
Zotac H55-ITX WiFi that we have compared Intel DH55JG with throughout this review is very energy-efficient when idle and under low load, both in its nominal and overclocked modes. However, it starts to consume a lot of power at high CPU loads because it sets the CPU voltage too high. We have not spotted Intel DH57JG do so, so this mainboard is energy-efficient both in the nominal and overclocked mode (but it has the lowest overclocking results because we could not increase the CPU voltage on it).