I bought a second hand Asus Geforce GTX 760 DirectCU II OC of ebay, it has a 8-pins power connector slot and a 6-pins to 2x molex connectors (3 pins each) adapter which is not the original one that comes with the card I think, anyways my PSU is Evo Labs Pentium P4 E-600BR, it does not have an 8-pins cable, it only have one 6-pins cable. How do I connect this card? do I need a new PSU?