5 expansion slots, 1 pci slots, 2 pci express x1 slot – Asus M4N78-AM User Manual
Page 15: 3 pci express x16 slot, Expansion slots -6 1.5.1, Pci slots -6, Pci express x1 slot -6, Pci express x16 slot -6, Ddr2-667mhz capability
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