Conversely, a PCIe 3.0 card can fit in a PCIe 4.0 slot, but again it would be limited by PCIe 3.0. If you have a PCIe 4.0 graphics card you can use it with a motherboard designed for PCIe 3.0 however, the card’s available bandwidth would be limited to the capabilities of PCIe 3.0. Modern graphics cards use x16 slots, for example, while M.2 “gum stick” NVMe SSDs use special slots with two or four lanes. The more lanes a slot has the faster data can flow to and from the card. Those numbers denote how many “lanes” each expansion slot has. PCIe expansion slots on your PC typically come in four flavors x1, x4, x8, x16.
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