M-key slots and cards for PCIe up to x4, and B+M cards for PCIe up to x2 and compatibility with both B-key (WWAN) and M-key (SSD) sockets. There’s plenty of M.2 sockets for sale, and templates ...

The PCI Express 5 standard was released back in 2019 ... tells you how many lanes that PCIe slot has. For example, a PCIe x4 slot has 4 lanes. Q: Can I insert an old PCIe 4.0 compatible peripheral ...