6:
1 x PCI-E x8 (Gen2 x4 link), FH, FL (MIO supported)
1 x PCI-E x8 (Gen3 x8 link), FH, FL
1 x PCI-E x16 (Gen3 x16 link), FH, FL
or 1 x PCI-E x16 (Gen3 x8 link), FH, FL + 1 x PCI-E x8 (Gen3 x8 link), FH, FL
1 x PCI-E x16 (Gen3 x16 link), FH, FL
or 1 x PCI-E x16 (Gen3 x8 link), FH, FL + 1 x PCI-E x8 (Gen3 x8 link), FH, FL