ASUS Rampage IV Extreme: PCI-E 3.0 Slots - 5 (x16, x16, x16, x16, x8)
ASUS MAXIMUS VI EXTREME: PCI-E 3.0 Slots - 5(x16 or dual x8 or x8/x16/x8 or x8/x16/x8/x8)
ASUS Rampage IV Extreme: PCI-E 3.0 Slots - 5 (x16, x16, x16, x16, x8)
ASUS MAXIMUS VI EXTREME: PCI-E 3.0 Slots - 5(x16 or dual x8 or x8/x16/x8 or x8/x16/x8/x8)