Hey just got a new gpu (gtx 980) my power supply is a corsair cx750m which came with 2x pci-e cabels that have 2 6+2 pin connectors. Will i be able to fully power the gpu (has 2 6-pin connections) with the one pci-e? Or do i need 2 individual 2x 6+2pin cables just to plug in one of the 6pin ports on the gpu. thanks