Total System Power Use
We used the Watts Up? Pro meter in the following tests, which 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 running tests.
To test total system power use, we used AIDA64 System Stability Test to load the CPU, and then recorded the results.
A 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 or max loads, which is to be expected.