PCIe 4 vs PCIe 3: Do you need Gen 4 in 2020?

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It should work on your mobo regardless A PCIe graphics card will work in a PCIe motherboard slot at PCIe speeds For PCIe

pcie x1 slot function Currently, even the fastest graphics cards from Intel, AMD, and Nvidia still utilize the outdated PCIe standard Sure, you can pair them with a PCIe Gen 5

pcie slot width 4 minutes 25 seconds