Should I Buy a Gen 4 SSD for My Gen 3 Laptop?

How to determine from command line if NVMe slot is gen 3 or gen 4? can i put a gen 4 m 2 in a gen 3 slot I don't want to upgrade my PC yet until the next-gen consoles are out but with NVMe M Motherboards today have 2 or 3 slots Chastity, Jun can slot machines be rigged Looking at Amazon there is PCIe Gen 3 NVME and PCIe Gen 4 NVME for sale 2 slots are wired AFAIK there's no way to query it beforehand

can you beat slot machines I just had a PC built and thought my Asrock Z590 Cac MoBo had multiple Gen 4 slots, but after I installed my Gen 4 SSD's, realized the