Robert, the Haswell platform involves a single port with 16 lanes for PCI-e, but it only takes care of PCI-e3.0 and the motherboard PCH takes care of the PCIe 2.0 (2x 4x 8x16x). The 8 lanes included in the PCH are dedicated for the PCI-e 2.0 in general (distributed among the different PCI-e slots).
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