How to determine from command line if NVMe slot is gen 3 or gen 4?

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PCIe slot behaviour with Dual NVMe PCIe adapter slot 2,3,4,5,6 and 7 respectively However, the CPU socket only has three PCIe

PCIe slot behaviour with Dual NVMe PCIe adapter slot 2,3,4,5,6 and 7 respectively However, the CPU socket only has three PCIe Technologies ; Additional Features, PCIe, Gen 4, Gen 4, Gen 3 ; NVIDIA Encoder , Gen 8, Gen 7, Gen 7

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