PCIe Gen 4 vs Gen 3 Slots, Speeds

SATA SSDs and SSDs that use two PCI Express lanes tend to use keys B and M to maximize compatibility, since both connectors can deliver both

Verilux NVIDIA NVME Adapter PCIe x16 with Gel Pad, NVME or AHCI SSD to PCIE Adapter Card for Key M 2230, 2242, 2260, 2280 Size SSD, Support PCIe x4

m2 pcie 40 in 30 slot 2 drives are “keyed” at one end so as to prevent the end-user from inserting them in an incompatible socket PCIe NVMe drives are 'M' keyed SATA ones,

m2_1 slot as far as available PCIe slots on the motherboard that is irrelevant, since 99% of AM4 motherboards come with 1, 2 or