Will a M+B key 8x Sata card work in a M key socket?

Solved: Upgrade HD->SSD - HP Support Community m 2 slot ssd PCIe and particularly PCIe slots add complexity to motherboards making them more expensive They take up a lot of PCB space They're m2 slot pc “an M key slot is compatible with both B+M key SSD and M key SSD ” So again the question is does that M key slot also have to support Sata

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