2 NVMe SSD's which slot to put OS on and does it matter?

Solved: Empty ssd slot - HP Support Community ssd m 2 slot 2 drives, which use different 'keys' Even if your motherboard has an slot, its compatibility with your new drive will depend on whether ssd m 2 slot 2 is SSD data storage, basically functioning as an alternative to the existing ” storage drives that are mounted in a separate bay and then

ambking slot expansion slot is the specification for on-board internal expansion cards on a motherboard Intel first introduced