We used the WattsUp? Pro meter in these tests. This allowed us to measure power use directly from the wall. This meter also uses a USB cable to connect to a computer and Logger Pro software to graph the readings while we run our tests.
To test total system power use, we used AIDA64 Stability test to load the CPU,and then recorded the results.
Here we can see the difference between single-socket and dual-socket systems. The ASRock EP2C602-2T/D16 dual-socket system can use around two and a half times more power than the other single-socket systems. Not only does this board have more CPUs but it also comes with larger amounts of RAM, which increases power use.