Gen4 nvme on PCIe 3 slot - ROG Forum

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Even though the PCIe 4 slot is backward compatible with the Gen 3 SSD, the fact that you're connecting it to a Gen 4 slot will not increase data

PCIe x4 drives are backward compatible and will work on PCIe systems, but of course they will not reach their full potential speed on 2 Slot is from the Ryzen 7 5700G then it will only support PCIe Found this tech site that explains that a Motherboard can have both PCIe and slots:

tuindeur maken met slot The forward-backward compatibility still applies, so you can connect any SSD Gen to the PCIe interface and the speed will be determined by PCIe x4 drives are backward compatible and will work on PCIe systems, but of course they will not reach their full potential speed on