Amazon.com: ADT-LINK Riser PCI-E 3.0 16x to x1 PCIe x16 x1 PCI Express Riser Mining Graphics Card Extension Cable R13SC 25cm with Power Line (No Power Cable) : Electronics
Gigabyte: PCIe Gen5 graphics cards to require either 16-pin power cable or "3x8-pin to 16-pin" adapter - VideoCardz.com