PCI-E 3.0 x1 Lane to M.2 M-Key SSD Nvme AHCI PCI Express Adapter Card PCIE SSD | eBay
The Primer: PCI Express 1.0 vs. 2.0 - 6Gbps SATA Performance: AMD 890GX vs. Intel X58/P55
PCIe X1 and X4 to NVME SSD adapter cards review and install - YouTube
Does the PCIe x1 m.2 adapter work? Yes, but there are some downsides.
What are Small PCIe x1 Slots Used For?
Controller Card PCI Express x1 2.0 - For 2 SSD M.2 Type SATA in Formats 2280, 2260, 2242 and 2230 - Chipset ASM1061- by Computer District: Amazon.de: Computer & Accessories