I wasn't being an ass, you asked a question about a totally different product. These don't connect the power lines. Power is supplied by the molex, I have tested amp draw on all the lines. There is no "current backflow". This is NOT a ribbon cable, but a usb cable. These are designed for this purpose.
If you say so bud. Confirmation that none of the 12v lines were connected back to the motherboard would have been sufficient. I'm aware they are different products, that's exactly why I had to ask the question.