Summary: The LS-550 (New) proved to be a good mainstream 550 W unit, providing a decent efficiency between 84.5% and 85.7% if you pull between 20% and 60% (between 110 W and 330 W) from its labeled wattage.
Summary: I used the
Kill A Watt P3
to measure system load, which was determined to be around 110W at idle and 200W under load. To generate the load conditions I ran the F@H SMP client, 3DMark and a drive replication process simultaneously.