Amazon.com: PCI Expansion to U.2 Adapter Card, PCIe X16 to 4 Port U.2 NVME SFF-8643/8639 Expansion Card, High Speed PCIE Split Expansion Card with LED Indicator for Windows : Electronics
2.5 Inch U.2 NVMe drive to PCI Express x16 Slot card or SATA III Interface 857426008284 | eBay
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
PCI Express x16 Riser Card
The difference between PCIe x1, x4, x8, x16 - DuroPC Industrial Computers