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

click to enlarge
Figure 14: Power supply label (pay attention to the “max 1 second” near “550 W”).

This power supply features two +12 V virtual rails distributed like this:

• +12V1 (solid yellow wire): All cables but the ATX12V and main motherboard cable.
• +12V2 (yellow with black stripe wire): ATX12V and main motherboard cable.

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