PCIe NVMe SSD on PCIe slot-Worth it?

How to determine from command line if NVMe slot is gen 3 or gen 4? nvme gen 4 in gen 3 slot ➤ High-speed NVMe PCIe Gen3 x4 Interface:combine the next-gen PCIe Gen 3x4 NVMe interface with the latest V-NAND technology nvme 40 in 30 slot 5+3 Phases Pure Digital VRM Solution with Low RDS MOSFETs 9 Supports 3rd Gen AMD Ryzen™ Processors 10 Dual Channel DDR4, 4 DIMMs 11 Dual

nvme m2 slot Gen 4 is faster than Gen 3