On Figure 19 you can see this power supply label containing all its power specs.

click to enlarge
Figure 19: Power supply label.

As you can see this power supply has four virtual +12 V rails. These rails are distributed like this:

• +12V1 (yellow with black stripe wires): Motherboard main cable and peripheral connectors from the modular cabling system (connectors marked as “V1”).
• +12V2 (solid yellow wires): One of the EPS12V connectors (the one that can be separated into two ATX12V connectors).
• +12V3 (yellow with orange stripe wires): The other EPS12V connector, the video card auxiliary power cable that is permanently attached to the power supply and the two video card power connectors from the modular cabling system marked as “V3”.
• +12V4 (yellow with blue stripe wires): The four video card power connectors from the modular cabling system marked as “V4”.