PCI Express 6 pin-Female to 8 pin-Male Power Adapter Cable - Micro Connectors, Inc.
Amazon.com: COMeap (2-Pack) 6 Pin Male to 8 Pin (6+2) PCI Express Power Adapter Cable for CoolerMaster and Thermaltake Power Supply with 6 Pin Port 20-inch (51cm) : Electronics
Sonnet 6-Pin PCIe Power Connector to 4-Pin Pro Tools TCB-HDXB
Amazon.com: StarTech.com 6in LP4 to 6 Pin PCI Express Video Card Power Cable Adapter - Power adapter - 4 pin internal power (M) to 6 pin PCIe power (M) - 6 in - LP4PCIEXADAP : Electronics