DELOCK 41427: Riser card PCIe x1 > 4 x x16, 60 cm USB cable at reichelt elektronik
Speed testing -x16 vs. -x1 with PCI Express video cards
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