PCI-e 6 Pin Female 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 8.86 inches(6PCS) - Newegg.com
PCI-E GPU 6-pin to 8 6+2-pin(6-pin/8-pin) Graphics Card Power Cable PCI Express | eBay
Solved: HP Z420 - 600W psu 6 pin to 8 pin adapter-cables - HP Support Community - 8440647
PCI-e 6 Pin to Dual PCIe 8 Pin (6+2) Graphics Card PCI Express Power Adapter GPU VGA Y-Splitter Extension Cable Mining Video Card Sleeved Power Cable 9 inches 2 Pack - Walmart.com