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 Asus Maximus III Formula we also included the results for all previously tested LGA1156 mainboards.
We noticed that during CPU overclocking Asus Maximus III Formula mainboard increased the voltages set in the BIOS quite noticeably, so we had to correct the settings accordingly. Therefore, I wouldn’t be surprised to see this board consume more power during overclocking. However, in this case the power consumption of this solution appears to be at about the same level as that of the others. At the same time, I was quite disappointed with the high power consumption readings in the nominal mode: it turned out the most resource-hungry LGA1156 solution of all tested. Under any loads and even in idle mode the board consumed considerably more power, which is a pretty serious issue.