OCC has published a review on the Antec Truepower Quattro 1000W Power Supply

The Antec Truepower Quattro 1000W lacks modular cable connections in my opinion. It will easily power two high end graphics cards in SLI or Crossfire, but that's as far you go with the four available PCI-E connectors (two 6+2-pin and two 6-pin). Power consumption of a high end dual graphic card computer would be 600-700W maximum, which leaves 300-400W of unusable power. That's fine for the user who likes a little headroom, but it does prevent the use of this power supply with three high end graphics cards - rare I know, but they are out there, and the Antec Truepower Quattro 1000W could power such a configuration with more connectors.

Antec Truepower Quattro 1000W Power Supply Review