It has 4x12 V rails with 20, 20, 30, and 30 A on each rail. What they don't say is if they put 1 pci-e per rail. They also don't specify how the regular 12 V molex connectors are distributed across the rails. I will try putting one or two pci-e 6 pin adapters on these. Sadly the it87 sensor on this motherboard does not give me much useful voltage information. I suppose my next test would be to get a 500 W psu and use it to run one of the cards independently.