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

How to determine from command line if NVMe slot is gen 3 or gen 4? nvme in pcie slot 2 slots support only PCIe SSDs Combo SSD slots support both interfaces so you can use either a SATA SSD or a PCIe SSD with them NVMe is nvme slot PCIe SSDs are too expensive and run too hot to be recommended But if you really must have the fastest storage out there, then the Teamgroup

nvme slot So I spotted this today a single slot x16 PCI-e expansion card for 4x NVMe drives:

nvme m2 slot laptop You can have one, four, eight or sixteen lanes in a single PCIe slot, denoted as x1, x4, x8, or x16 PCIe technology enables interface speeds of 2 slots — supporting both PCIe and — that allow you to expand your system with high-performance SSD storage Designed for the latest generation of NVMe