M2 Key E

2: one with a B key and one with a M key to PCI-E x4 adapter that can take multiple lengths of drives socket types B+M keyed

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m2 slot mainboard Two types of SSD Note: SSDs using the PCIe x4 bus use M-keys since it is the only one that supports PCIe x4 lanes

m24 slot I'm now inclined to think the slot is not backwards compatible with SATA drives (or at least I can't find anyone in the Dell community