How to Install an NVMe PCIe SSD

Is it okay to use PCI Gen 4 drives with gen 3 slots? can you put a gen 4 ssd in a gen 3 slot It's both backward and forward compatible with newer or older generations via software or mechanical interface That means the PCIe devices can i buy a slot machine Practically if you want the fastest drive, match the generation of your slot with the drive (so if you have a PCIe gen 4, get a gen 4 compatible

candy bars slot How does the generation affect my choice of GPU and SSD ? Every generation of PCIe is forward and backward compatible but