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

m 2 gen 4 in gen 3 slot
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A gen 4 device will work in a gen 3 slot but generally won't run at full speed Also check the warranty I have Samsung, Western Digital

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m24 slot Built with a PCI Express® Gen 4 x4 interface, 3D NAND flash, an 8-channel 2 slot Technology T Advanced Garbage Collection RAID Engine

m2 slot screw Silicon Power's XS70 Gen 4 x 4 drives are so affordable now, that it kind of makes sense to