On Figure 14 you can see this power supply label containing all its power specs.

click to enlarge
Figure 14: Power supply label.

This power supply has four virtual rails, distributed like this:

• +12V1 (solid yellow wire): Two of the video card power connectors (the ones on the far right) from the modular cabling system.
• +12V2 (yellow with blue stripe wire): Two of the video card power connectors (the ones on the middle) from the modular cabling system, one of the video card cables that are permanently connected to the power supply and EPS12V connector.
• +12V3 (yellow with black stripe wire): One of the video card cables that are permanently connected to the power supply and ATX12V connector.
• +12V4 (yellow with green stripe wire): Main motherboard cable, peripheral power connectors and SATA power connectors.

We think Nexus could at least label outside the power supply the rails each connector is attached to in order to make it easier for the advanced user to balance the load among all available rails.

Let’s now see if this power supply can really deliver 850 W.