Explaining PCIe Slots

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My motherboard has three pcie x16 size slots, but I cannot use one of them for usb controller pcie x4 card: the pcie16_1 is for GPU, the

No it will not give you a performance decrease in the PCI-e lanes if you use that x16 slot As defaultuser mentioned the only other PCIe slots are used to connect graphics cards, sound cards, other interface cards and some

slot bonus buy In case you are not aware, you can use your PCIe x1 device on any other PCIe slots Be it the x4 or even another x16 slot without any issues 1 x PCIe x4 Slots 5, 1 x PCIe x4 Slots 6, 1 x PCIe 7 graphics card also supports PCI-E Gen4 bandwidth Audio+ HD