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Motherboard pci express x16 slot specification details explained in slot pcie x16 On current Intel single socket systems a PCIe switch is required to get 4 full X16 slots for GPU's The alternative possibility for 4 GPU's on slot machine christmas ornament However, there is usually a cost increase incurred with higher lane counts PCIe Slot Differences Photo from 20050531pci-express-cards

slot pcie x16 PCIEX16E-844S is Bifurcation PCIe x16 edge connector to one x16 & two PCIe x16 Slot Interconnect Cabling solution