6 inch 2 x Molex 4 pin to 8-Pin PCI Express Video Card Pci-e ATX PSU Power Converter Cable - Molex to Pcie 8 pin (6+2) Adapter Internal Power Cables - Newegg.com
All about the various PC power supply cables and connectors
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6 Pin to 8 Pin PCI Express PCI-E Video Card Power Adapter Converter Cable 6-8p | eBay
Amazon.com: TeamProfitcom PCI-e 8 Pin Male to Dual 8 Pin (6+2) Male PCI Express Power Adapter Cable for EVGA Modular Power Supply Cable for Graphics Video Card 8 pin Splitter 25+10 inches : Electronics