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

How can I find out what Gen of NVME my machine supports (what m 2 gen 4 in gen 3 slot A gen 4 device will work in a gen 3 slot but generally won't run at full speed Also check the warranty I have Samsung, Western Digital m2 pcie 40 in 30 slot NVMe SSDs, even the last-gen PCIe Gen 3-based NVMe SSDs, are immensely faster than this There's no point in getting a sick Gen 4 NVMe

m2 slot screw Learn to distinguish cards, including slots, keys, sizes, and types Understand slot functionality, and PCIe interfaces, and the platform's