What is PCIe? Understanding PCIe Slots, Cards and Lanes

pcie ssd in slot : rbuildapc m 2 pcie 4 0 in 3 0 slot To be specific, a PCIe slot has an 8 GTs transfer rate per lane, while a PCIe slot has a 16 GTs transfer rate per lane Moreover, the m2_1 slot I had an Asus HYPER X16 GEN 4 CARD for 4 Nvme but it's OK for only one slot I should change to x4x4x4x4 in my bios Another idea was to

m2 pcie 40 in 30 slot The card physically has an X4 interface, so it could be plugged into an X4, X8, or X16 slot It can still physically only access 4 lanes (else