3 interrupt assignments, 4 pci express x16 slot (x16 link), 5 pci express x16 slot (x8 link) – Asus Z9PE-D16 User Manual

Page 35: 6 pike slots, Interrupt assignments -17, Pci express x16 slot (x16 link) -17, Pci express x16 slot (x8 link) -17, Pike slots -17, Standard interrupt assignments