M vs : What's the Difference?

Sonnet 8x4 Silent Gen4 PCIe Card pcie m 2 slot An M2 PCIe SSD solid state drive storage slot on a motherboard, ssd in motherboard slot ssd in motherboard slot Stock Photo Hard disk SSD m2 on pciex1 slot 2 slots on the motherboard can utilize two to four PCIe lanes, with PCIe having a 16Gbs transfer rate on each lane makes incredibly

pcie x1 in x16 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