Amazon.com: GLOTRENDS M.2 PCIe X1 Adapter with M.2 Screw for M.2 PCIe 4.0/3.0 SSD (NVMe/AHCI Key M), PCIe X1/X4/X8/X16 Lane Installation, but Only PCIe X1 Bandwidth (PA09-X1) : Electronics
hardware - What's the bandwidth and form factor for PCIe x1 x4 x8 and x16? - Server Fault
PCIe X1 to PCIe X16 Expander, Using With M.2 to PCIe 4-Ch Expander | PCIe-X1 -TO-PCIe-X16-Cable
Q. Should I get a motherboard with two PCIe x16 slots or more x1 slots?
R3y Series PCIe x1, x4, x16, M.2 KeyM / A+E, mPCIe (mini PCIe), U.