In Figure 14, you can see the power supply label containing all the power specs.

click to enlarge
Figure 14: Power supply label.

This power supply uses a single-rail design, so there is nothing to talk about here. Keep in mind that the difference between a single-rail design and a multiple-rail design is how the over current protection (OCP) circuit is connected. On single-rail design there is only one OCP circuit monitoring all outputs, while on multiple-rail design there are several OCP circuits, each one monitoring a group of wires called “rails.”

Now let’s see if this power supply can really deliver 550 W.