On Figure 16 you can see this power supply label containing all its power specs.

click to enlarge
Figure 16: Power supply label.

As you can see this power supply has three +12 V rails, which are distributed like this:

• +12V1 (solid yellow wire): Main motherboard cable, peripheral power connectors and SATA power connectors, including the ones from the modular cabling system.
• +12V2 (yellow with black stripe wire): ATX12V and EPS12V connectors.
• +12V3 (yellow with blue stripe wire): Video card auxiliary power connectors, including the one from the modular cabling system.

If the three rails had the same current limit we would complain for the fact that +12V3 is more loaded than the other two rails. However if you pay attention to the label this rail has a higher limit. Thus we don’t think this will be a problem. Just to remind, power distribution is important because what defines a +12V rail is the presence of an individual over current protection (OCP) circuit and we are trying to avoid this circuit from shutting down the power supply under normal working conditions because you have power-hungry components.

Let’s now see if this power supply can really deliver 650 W.