If, as I suspect, it is a 6 pin female, you take the 6 pins from an 8 plus 2 and connect it, leaving the +2 pins
hanging idle.If it is an 8 pin femail, you put the plus two pins in as well. You cant put wrong pins in wrong places, they are all different shapes.
The link above leads to a cord designed for Macs that looks exactly like the sort of connections I would need to marry my GPU and PSU together. Correct me if I'm using the term wrong, but both ends shown in the display pictures appear to be female ends. Whatever the accurate term is, those shapes within a single cord are what I would need based on the available ports on my GPU and PSU. I'm concerned though because my desktop is not Mac architecture, it's an ASUS P877-V LK motherboard.
You're right, I am looking for a 6-pin to 6+2-pin PCI-E cord, which led me to the amazon link above, but it is the only one I've seen so far where both ends of the cord would fit into my GPU and CPU properly. Most similar cords seem to have a standard design of one female and one male connector, but I need a cord where both connections are the same gender, aside from a difference in pin number.
I may try taking pictures of my GPU and PSU so I can better explain why I'm confused about the power cord requirements.