M vs : What's the Difference?

The M-key just means that the controller supports fast SSD A modern M-key PCIe has a good chance of supporting NVMe, while if it was made

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m2 slot screw 2 SSD up to Gen5 x4 128Gbs; XXL aluminum cooling fin; Dual variable 2 Sockets , supports type 22422260228025802211025110 PCIe Gen5x4

m2 slot mainboard Currently the keys B, M, A and E together with B+M and A+E are in use The slot and the module have to support the same key in order to be