Install a Half Height PCIe Card
If you are installing an x16 PCIe card in slot 6, you must
install the motherboard PCIe Flyover cable in to slot 6 to enable support for a PCIe x16
electrical interface; otherwise, slot 6 supports only a PCIe x8 electrical interface. If
you are installing a PCIe card in slot 7, you must install the motherboard PCIe Flyover
cable in slot 7 to support a PCIe x8 electrical interface; otherwise, PCIe slot 7 is
non-functional. See Configure PCIe Electrical Interfaces Using the PCIe Flyover Cable.