What is the difference between PCIe Gen 3 and PCIe Gen 4?

And, I also tested the performance gain when connect PCIe gen 4 onto gen3 slot

Empowering you to effortlessly breeze through the most demanding of tasks Up to 32 GB LPDDR5X-6400 DRAM Up to 2 TB PCIe Gen 4 SSD Up to hours3

pcie x 16 slot Testing and installing a Gen4 NVME SSD on a Gen3 Motherboard This includes Unboxing

pciex16 slot configuration Apparently the cross-compatibility and quality are quite variable PCIe = gen3 seems easier than gen4, though, and for your needs it sounds