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If I use an NVMe PCIe Gen4 on an X16 slot of PCIe 3.0 ... do I get the full speed of the PCIe 4.0 NVMe? No. PCIe 3.0 and PCIe 4.0 are like different "languages" that are used over the same physical connection. If your PC does not "know that language" it will fall back to the lowest common version of PCIe that both devices support. I ...

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