| Lian Li 750W Maxima Force Series Power Supply
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Testing (continued):
The chart below shows the results obtained from the Seasonic Power Angel while the idle and load testing already described was being conducted. The Power Angel takes a look at the AC power being provided to the system with each of the five power supplies installed to see how things may differ.
In the first portion of the chart we see that the power factor values for all three units hit the expected 99% when the system was in the load condition. The second value shown in this first half of the chart details the amperage on the 120VAC line. What we see is that when powering the same test system, the Lian Li unit finishes right in the middle of the pack. Drawing less current is better, and we see that under the load condition the difference from best to worst is only 0.20A, with the Lian Li unit coming in 0.08A from being the best!
In the second portion of the chart we see the values for the wattage (W) and apparent wattage (VA). It is to be expected that the Wattage reading will be lower when the amperage is lower, since the supply voltage should be about the same and the equation is P=V*I (power equals voltage times current). Here we see the Lian Li unit comes in 5W shy of being the best and 11W better than the worst.
With my current electric rate of 15 cents per kWh, we can compare the annual operating costs of a system with each of these power supplies (assuming the systems were in the load condition 24/7/365):
» Lian Li: $508.52
» Thermaltake: $507.20
» BFG Tech: $501.95
» Nesteq: $512.46
» Rosewill: $522.97
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