8 expansion slots, 1 installing an expansion card, 2 configuring an expansion card – Asus M4N78 SE User Manual
Page 27: 3 pci slots, 4 pci express x1 slot, 5 pci express x16 slot, Expansion slots -17 1.8.1, Installing an expansion card -17, Configuring an expansion card -17, Pci slots -17
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