About M.2 PCIe x2 / x4

[rrr2015]

This pretty new to me & still trying to understand
it comes with B, M, B+M key & SATA / PCIe3

so my question is: if my mobo with M-Key PCIe x2, will SSD with M-Key PCIe x4 work on this slot?

 

[Shutterbox]

It will, at x2 speed

PCIe x2/x4 ssd usually is m key only

Those b, or b+m key usually is PCIe sata3 based.

This is what I understand

 

[rrr2015]

thanks much!
gigabyte m.2 pciex2 nvme ssd comes with b+m key. but am not buying this brand

It will, at x2 speed

PCIe x2/x4 ssd usually is m key only

Those b, or b+m key usually is PCIe sata3 based.

This is what I understand