Can I use an M2 SATA in an NVMe slot
A slot that can do SATA will have the M key and/or B key.
A slot that cannot do SATA will not have either the M or B key, but others instead, making it physically impossible to insert a SATA-only card.
A card with multiple keys can only use the lowest common set of features. With B+M, that’s PCIe x2, SATA and SMBus.
Because an M.2 NVMe SSD typically wants PCIe x4, there’s only one possibility: M key.
It might be noteworthy that slots with multiple keys are very rare, if they exist at all.
If a card physically fits the slot, it will work. That’s the entire idea behind the key notches.
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