Difference Between PCI Express Gen 1, Gen 2, Gen 3, & Gen 4 – DESKDECODE.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) Add-On Cards - Newegg.com
What is the actual speed of a PCI-Express x1 (PCI-E 3.0) slot? - Quora