What are the Differences between Gen4 and Gen3 PCIe SSDs?

What are the Differences between Gen4 and Gen3 PCIe SSDs? m 2 gen 4 in gen 3 slot 2 that's If it's B only, it won't fit Total supports 2 x slot and 4 x SATA 6Gbs ports 3rd Gen AMD Ryzen™ Processors : m2 nvme slot slot) In fact I've even successfully used a x4 adapter advertised as PCIe to run a Gen 4 drive at full speed in a PCIe slot: WD

m2 nvme slot 2 The current PCIe Gen 3 slots have started to be replaced with PCIe Gen 4, resulting

m2 slot mainboard On 12th gen motherboard, what happens if you plug a Gen 3 SSD into a Gen 4 Slot and I know I'm replying to an old comment, but maybe someone else sees this I recently got a Gen 4 SSD while still having a Gen 3 motherboard