A standard PC molex connector has the red as +5v, the black is 0v (Ground) and the yellow is +12v. The ones with 2 cables to the pin usually just mean they're serially in line with another plug.
The 6 pin connector on the card is a PCI Express Power connector and is connected as follows, from top left to bottom right, Ground, Ground, Ground, +12v, N/C, +12v.
An article I read on this card suggested that all 5 working pins on the card should be connected, I presume the 'Y' cable is configured to provide this from 2 standard molex connectors.
If you trace from the PC Power Supply molex connectors back through to the card, you should effectively be connecting the PC's cabling to the card as described above, with black cables at the molex leading to the top 3 pins on the card and yellow leading to the 2 on the bottom row.
Hope this helps.
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DOLPHIN 38
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