Pi 5 PCIe Gen 3 SSD Performance vs USB 3

What are the Differences between Gen4 and Gen3 PCIe SSDs? m 2 gen 4 in gen 3 slot PCIe gen 4 was able to reach a bandwidth of s whereas the PCIe gen 3 was only able to reach s That is a 39% benefit if you were m2 slot screw And, I also tested the performance gain when connect PCIe gen 4 onto gen3 slot

m2 slot types 1x SSD slot , 1x SSD Combo (NVMe PCIe Gen3 1x 2280 NVMe Gen 3 slot + 1x 2280 Gen 4 ; 1x 2280 NVMe Gen