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

can i use gen 4 ssd on gen 3 slot   Dan candyland slot

Consider that a high-end, AAA game can use more than 100GB of Fastest Gen 4 SSD to date + Samsung software and support + Heatsink

We still recommend Gen 4 drives over Gen 5, as currently there's little real world advantage over the latest versions, but if that changes we'll Yes you simply cannot do 7000+ MBs on Gen 3 x4 I run a PCIe Gen 3 x4 NVMe SSD through my chipset coming from a Gen 2 x4 slot

anniversary narrows slot canyon Gen 4 SSDs aren't worth it unless you're working with large files and doing a lot of sequential readwrites  The first generation of PCI Express SSDs made use of a PCI Express x2 interface with throughput higher than SATA , but not enormously so That's changed