"+12V1&+12V2 COMBINE POWER SHALL NOT EXCEED 348W
+5V&+3.3V SHALL NOT EXCEED 140W
MAX. OUTPUT POWER: 400W"
That's what it says on the label.
And still not sure about the 6-pin connector.
But I'm assuming there is one because there is a connector connected to the 8600GTS from the PSU.
Looks similar to this picture here: http://www.playtool.com/pages/psuconnectors/pcie6.jpg
And yes it has 3 yellow cables and 3 black cables.