x99 Classified and FTW:
PCIe 2.0 4x, shared with PE5
x99 Micro2:
PCIe 3.0 4x, shared with PE3
please note that the m.2 ports on these boards do require a PCIe m.2 drive. A SATA m.2 drive will not be recognized on these boards.z170 Classified and FTW:
PCIe 3.0 4x, shared with either PE5 or SATA 4/5
z170 Classified K:
110mm - PCIe 3.0 4x, shared with SATA 4/5 (supports PCIe but does not share lanes with a PCIe slot)
80mm - PCIe 3.0 4x, shared with PE5 (does not support m.2 SATA)
The Classified K m.2 ports support RAID 0 and 1 with each other only.