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 Intel Core i7-860 CPU. For more illustrative picture we created a graph 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. Besides Intel DP55WG, we also included the results of all previously tested LGA1156 mainboards. The boards are sorted out in alphabetical order on the diagrams below.
The fewer chips there are on the PCB, the less power the board consumes, and we did notice a lot of empty spots when we checked out the PCB layout of our Intel DP55WG. No wonder that under all types of load, except the maximum, this solution proves more energy-efficient than its competitors. As for the power consumption in case of maximum CPU utilization, Intel DP55WG appears on the same level with most others because of the pre-increased voltages, but is still more energy-efficient than many of the tested boards.
We did lower the voltages during overclocking to avoid them rising too high that is why in the end Intel DP55WG consumes about the same power as its competitors. However, it did prove the most efficient in idle mode.