What he is trying to say is, are you sure its a true 8 pin connector as some are 6 + 2 so you can use the connector as either 6 or 8 pin connectors by breaking it apart
pci-e power leads come in 3 form factors. the 8 pin, the 6+2 pin and the 6 pin the 8 and 6+2 pin leads have 1 more 12v and 1 more ground than the 6 pin. which means it can offer higher voltages to the gpu.