why they say 14 when the last black pcie 1 isn't a pcie slot? i see only 13 slot? how do you connect the 14° gpu?
I think the seller miscounted hahaha

I checked it again today its no longer available
There are adapters to go from a M2 socket to a PCI-E - thus the potential for the 14th card.
Board is DESIGNED for 13 cards though.
There is no reason that a chipset that supports both PCI-E and SATA can't have a M.2 socket - that socket didn't add any new electrical interface types, just packages existing stuff into a different form factor.