| BFG Tech LS-680 680W Power Supply
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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 three power supplies to see how things may differ.
In the first portion of the chart below we see that the power factor values for all three units are similar, and that at load they all hit the expected 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 test system, the BFG Tech unit draws the least amount of current. This lower reading will translate into better (lower) values in the second portion of the chart, too.
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 when the Amperage is lower since the equation is P=V*I (power equals voltage times current).
At idle, the BFG Tech unit uses 10 Watts less than the Nesteq unit and 14 Watts less than the Rosewill unit. Load the system up and the BFG Tech powered system uses 8 Watts less than the Nesteq unit and 16 Watts less than the Rosewill unit. Not huge efficiency increases, but it would translate to a bit of saved money on your electric bill. With my current electric rate of 15 cents per kWh, the BFG Tech unit would cost $21.02 less than the Rosewill unit annually if the system were to be run under load 24 hours a day.
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