When measuring entire system power consumption, we found the MSI P67A-GD55 to be the most fuel-efficient, consuming 85 watts at idle. The Asrock, ECS and Asus boards all consumed around 90 watts at idle while the Gigabyte P67A-UD7 was the most power hungry consuming 101 watts.
Using Prime95 to stress all cores, the Asrock P67 Extreme6 provided the best results with the entire system consuming 185 watts. The ECS P67H2-A2 provided similar results with 186 watts as did the Asus P8P67 Deluxe at 188 watts.
Although the MSI P67A-GD55 consumed the least at idle, it was the second most power hungry board in our test with the total system consumption rising to 195 watts. The Gigabyte P67A-UD7 chugged even more power at 199 watts.
We monitored the CPU temperature with AIDA64 Extreme Edition and the Asus P8P67 Deluxe reported the lowest idle temperature at 22 degrees. Under load, it tied with the ECS P67H2-A2 at 45 degrees. The MSI P67A-GD55 and Gigabyte P67A-UD7 both reached a stress temperature of 49 degrees while the idle temperature was higher at 28 degrees as well.
The motherboard temperature was similar across all boards, but AIDA64 Extreme Edition reported once again that the MSI and Gigabyte boards were operating warmer. The Asus P8P67 Deluxe was found to have the lowest operating temperature when idle and under load.