No. It needs both an 8 pin (6+2) and a 6 pin to function. If your power supply does not have the required connectors then it is not of sufficient quality or performance to allow that it should be used with that graphics card. If it did, it would have several 6+2 pin connectors natively. The manufacturer tends to not include connectors that it is not capable of adequately supporting. You will need a better PSU with the necessary connectors.