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

slot supports PCIe Gen 4 x4 SSDs, while the right slot supports only PCIe Gen 3 x4 SSDs or SATA SSDs 0

I run a PCIe Gen 3 x4 NVMe SSD through my chipset coming from a Gen 2 x4 slot 2 connectors utilize 4 lanes which brings it up to a

m2 pcie 40 in 30 slot Performance PCIe NVMe SSDs Featured; Gen 5; Gen 4; Gen 3 Crucial T705 SSD Best for: Dedicated gamers, creative professionals, and workstation users

m2 sata slot Card capacity and size · Slot 1: gen 4, up to x16 lanes · Slot 2: gen 4,up to x16 lanes · Slot 3: gen 4, up to x8 lanes