Help understanding PCIe 16x8x16x8x

Help understanding PCIe 16x8x16x8x 4x pcie slot Slot 2, PCI Express x16 ; Slot 3, Slot not available on this board ; Slot 4, Slot not available on this board ; Slot 5, PCI Express x8 in a 4x8 slot car layouts Slot 2, PCI Express x16 ; Slot 3, Slot not available on this board ; Slot 4, Slot not available on this board ; Slot 5, PCI Express x8 in a

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4x pcie slot hello everyone, I need a motherboard with at least 4 x16 pciei, i dont care about about pcie version I need to install four 10 gigabit pcie card  Most of the time it works fine but some mainboardvideo card combos won't see a 16x card in a 1x or 4x slot due to the PCIe presence detect not