Cyanogen1 :
Zerk2012 :
The M.2 works off the SATA express not the PCI-E slot unless you buy a M.2 that is mounted on a PCI-E slot board.
The samsung drive states being an M.2 Pci-e x4, just would assume that it would end up taking pci lanes.
This is the drive for reference :
Samsung 950 pro
List the motherboard. Nevermind you already did.
Right off the board page SATA E
The SATA Express port or SATA5 and SATA6 ports will be unavailable when installing a module in the M.2 port.