Ok I’m taking out my gtx 680 and installing a gtx 1080. The 680 used two power cables one each from the two 6 pin ports on the motherboard. The 1080 use a single 8pin cable do I need a dual 6 pin to 8 pin cable or will a 6 pin to 8 pin cable that I use with the 680 work? I bought this last fall and have forgotten much about the install. So do I need a dual 6 pin to a 8 pin cable or will the single 6pin to 8 pin cable work?