Testing (continued):
The next set of results were obtained from the Seasonic Power Angel while the idle and load testing already described was being executed. This device takes a look at the AC power being provided to the system with the two power supplies to see how things may differ.
In the first portion of the chart below we see that the power factor values are similar, and that you need the load condition to make them hit 99%. The second value shown in this first portion of the chart details the amperage on the 120VAC line. What we see is that when powering the same system, the Nesteq unit draws 0.03A less at idle and 0.09A at load. A small difference, but the Nesteq unit is more efficient since it did the same job with less current.
The second half of the chart of Power Angel data shows the wattage (W) and apparent wattage (VA). The first note on these values is that they should not be confused with the DC wattage being put out to the components in the system. This is AC wattage coming from the electrical outlet. Since voltage should be about the same, it makes sense to expect the Wattage reading to be lower on the Nesteq unit since the Amperage value was lower (P=V*I). At idle the Rosewill unit requires 4W more, and at load it requires 8W more... a tiny difference. Putting it in terms of annual electricity costs means that this system running under load 24 hours a day and 365 days a year would cost $10.51 more with the Rosewill PSU as compared to the Nesteq PSU.
