In Figure 13, you can see the power supply label containing all the power specs.

click to enlarge
Figure 13: Power supply label.

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

• +12V1 (solid yellow wire): Main motherboard cable, SATA and peripheral power cables.
• +12V2 (yellow with black stripe wire): ATX12V, EPS12V and video card power connectors.

In our opinion this is not a good distribution, because +12V2 will be overloaded, since the components that most pull current/power from the power supply (the CPU and the video cards) are connected to this rail, while the +12V1 rail will always work  lightly loaded, as the motherboard and peripherals don’t pull a lot of current/power.

Now let’s see if this power supply can really deliver 620 W.