Amazon.com: M.2 to 3.0 Riser Card PH57, High Speed Transmission, Stable Operation, Support Hard Disk, 5 Port Expansion Card with PM PCIE to Adapter Card for OS X for Linux for Win :
64Gbps High Speed PCIe 4.0 X4 90 Degree PCI-E 16X To M2 M.2 M-Key Key M SSD Riser Cable Gen4 / 3 GPU Motherboard Extender es CPU - AliExpress
PCIe speed table (from gen 1 to gen 6) – NAS Compares