Seventeam ST-380PAS Power Supply Review

Power Distribution

In Figure 15, you can see the power supply label containing all the power specs.

Figure 15: Power supply label.

In theory this power supply has two virtual rails, distributed like this:

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

This is not well distributed in our opinion, as we prefer to see the ATX12V/EPS12V connector on a different rail from the video card connector. However, during our tests over current protection failed (which makes sense, as the monitoring integrated circuit does not provide this protection and Seventeam doesn’t list OCP as a feature available on this power supply), making this power supply to work like a single-rail design, so this +12V1/+12V2 separation doesn’t make sense.

Just to remember, the difference between a single-rail design and a multiple rail design lies on the over current protection circuit, where on a single-rail design it is monitoring all +12 V outputs at the same time, whereas on a multiple-rail design there is a separated OCP circuit for each group of wires (“virtual rails”).

Now let’s see if this power supply can really deliver 380 W.