X58 Extreme will have four PCI-E 2.0 x16 slots but there is a bit of a story to tell here. The PCI-E slots are paired in groups of two – if you use just the two blue x16 slots (one from each group), they will operate electronically at x16. If you use one x16 and one orange x16 slot in the same group, each will operate at x8 electronically. If you use all four x16 slots, they will all operate electronically at x8. The top two PCI-E x4 slots always run at x4 electronically, no matter what type of setup is in use.

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