PCIe Gen4 NVMe on PCIe 3 0 - Performance impact

Best NVMe SSDs 2024: The fastest storage drives you can buy nvme gen 4 in gen 3 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 nvme slot types 5+3 Phases Pure Digital VRM Solution with Low RDS MOSFETs 9 Supports 3rd Gen AMD Ryzen™ Processors 10 Dual Channel DDR4, 4 DIMMs 11 Dual

nvme slot Looking at Amazon there is PCIe Gen 3 NVME and PCIe Gen 4 NVME for sale I don't see this even mentioned on the Wikipedia page for NVM Express