8 expansion slots, 1 installing an expansion card, 2 configuring an expansion card – Asus M4A77T User Manual
Page 26: 3 pci slots, 4 pci express x1 slots, 5 pci express x16 slot, Expansion slots -16 1.8.1, Installing an expansion card -16, Configuring an expansion card -16, Pci slots -16
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