Asus Z97M-Plus M.2 Confusion

quantum mask

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Aug 24, 2009
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I have not bought this motherboard yet, still doing my research. However, I was reading the manual and on page 1-2 it says that the M.2 slot shares bandwidth with the PCI Express X2, but on page ix and everywhere else in the manual, it says it shares bandwidth with SATA III ports 5 & 6. It's still hard to find comprehensive information on M.2, but from what I understand, the M.2 device can either have a PCIe interface or a SATA interface, but not both. Am I wrong, or is the manual wrong, or am I misreading something? In either case, what exactly do I need to look for when purchasing an M.2 for this board?
I looked on the compatibility sheet (which had M.2 devices I could not find anywhere for purchase) and it had some devices that were SATA 3, some were PCIe X2, and one even said PCI E SATA. I don't want to spend $150 on a 128GB device and find that it's not compatible. Does anyone know how to find out?
I already tried to contact Asus twice . . . no response yet.
 
M.2 is it's own connection specification. It connects to the motherboard via the m.2. slot (mounts parallel to the motherboard same as a cpu vs perpendicular like ram or a gpu). It's one or the other. E sata takes special cables and connects via cable like regular sata except it takes up two sata lanes. If you choose to run an esata drive via ports 5&6 (using the e-sata cable) then it disables the M.2 slot. If you opt to use the M.2 ssd mounted directly to the motherboard, it disables the #5&6 sata ports. You cannot run an e-sata drive connected to the sata #5&6 ports AND an M.2 sata connected to the M.2 motherboard slot at the same time.