Is my Samsung 980 PRO NVMe running in PCIe 3 or PCIe 4

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2 supports both SATA and PCIe, an module may only be inserted in either one of the two interfaces, so check your motherboard documentation

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m24 slot PCIe buses can support 1x, 4x, 8x, and 16x lanes PCIe has an effective transfer speed of up to 985 MBs per lane which means there is a potential transfer