5 expansion slots, 1 installing an expansion card, 2 configuring an expansion card – Asus P8H61-M LX3 User Manual

Page 23: 3 pci express x1 slot, 4 pci express x16 slot, Expansion slots -13 1.5.1, Installing an expansion card -13, Configuring an expansion card -13, Pci express x1 slot -13, Pci express x16 slot -13