I just recently purchased an EVGA GeForce GTX 970. I bought the card through E-Bay. I did not get a power adapter. I have a 650W Antec power supply. It has two 6 pin pig tails. Do I have to have a 6 and an 8. If so where can I get an adapter. The card part number is EVGA GeForce GTX 970 04G-P4-3975-KR. I am upgrading from a GeForce GTX 640 and removed the drivers before installing. I then get the error listed here 'PLEASE POWER DOWN AND CONNECT THE PCIe POWER CABLE(S) FOR THIS GRAPHICS CARD'.