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
P27F Series (x16/x8/x4/x1) Flexible x16 PCI Express Extender
hardware - What's the bandwidth and form factor for PCIe x1 x4 x8 and x16? - Server Fault