What is the Difference Between PCIe Gen 3 & Gen 4?

Is it okay to use PCI Gen 4 drives with gen 3 slots? will a gen 4 ssd work in a gen 3 slot 4 x4 SSDs, while the right slot supports only PCIe Gen 3 x4 SSDs or SATA SSDs will help you ace your college course this year willis creek slot canyon trailhead Maybe, but only in sequential data transfers I would avoid the first generation of PCIe , as they rely on a modified PCIe controller

william slot Gen 4 is faster than Gen 3