Total System Power Use
We used the WattsUp Pro meter in these tests which allowed us to measure power use direct 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 ran our tests.
To test total system power use we used AIDA64 Stability test to load the CPU and then recorded the results.
A really good feature of both the i7 4771 and E3-1285v3 is the low power use of these CPU's. The chart shows no real difference between the two at idle and max loads, and that is to be expected.