Question: psu has no 6 pin?
Answer: SATA to 8-Pin PCI-E Adapter Cable – If your graphics card has an 8-pin connector but your power supply has neither 6-pin or 8-pin connectors then you can use this SATA to 8-Pin converter cable to power your graphics card. This power adapter cable uses two SATA connectors for one 8-pin power connector.