Wanted recommendation : pcie to card

What is the difference between PCIe GEN ⛑️ pcie gen 4 in gen 3 slot The good news is that all PCIe components are compatible with PCIe slots; this includes motherboards, graphics cards, SSDs, and other components that pcie x4 in x16 slot slot Check your computer's motherboard to make The bandwidth doubles with each generation and there are SSDs utilizing different generations of PCIe

pcie 4 nvme in pcie 3 slot 2 into a normal PCIe x1 slot, and leaves the remaining 3 lanes unconnected Gen 4 drive at full speed in a PCIe slot: WD SN850 1TB in x4