Different M 2 Slots. High end ssds as well as recent motherboards will have to use an m key slot as this is the only type that provides four lanes of bandwidth or 20 gbit s also known as pcie x4. One with a b key and one with a m key.
The slot on the left uses module key e and the one on the right uses module key b. The socket can be either b or m but not both. As the m 2 standard requires the ssds or other types.
In this post minitool provides you with detailed information about the m 2 slot.
As the m 2 standard requires the ssds or other types. Above is a picture of two m 2 slots on the motherboard of an hp stream mini. M 2 pcie ssds use the pci express lanes. The wi fi card is keyed for slots a.
