Technically if they jump 2-pins off of the 6-pin, you gain no advantages over a 6-pin connector. Sales of a 6+2-pin is a gimmick(unless there is 8 wires from PSU), that gets you to buy a 6-pin as if it were a 8-pin. If there is not 8 wires from the power supply, power ratings can not be calculated as 8-pin.So I'd plug the 6+2 in there.