Amazon.com: CPU 8-Pin Extension Cord, PCIe 8 Pin Female to 8(6+2) Pin Male PCI Express Power Adapter Cable Motherboard CPU 8-pin to Graphics Card 8-pin 18 AWG Cord -18CM : Electronics
Corsair® PSU Type 4 Cables Pinout – PC Mods
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
Power Supply Connectors and Pinouts
Can I plug a 6-pin into an 8-pin GPU? - Quora
pci express - Does a PCIe 8pin power cable use just one 12V rail. - Super User