Cannot find PCIe NVMe SSD during Windows 11 installation

installing Gen4 NVME on a Gen3 Motherboard will gen 4 ssd work in gen 3 slot My laptop has a gen 3 slot First of all, I know that a PCIe 4 SSD NVMe will be running at gen 3 speeds and bottlenecked by the PCIe 3 slot But willy wonka slot On 12th gen motherboard, what happens if you plug a Gen 3 SSD into a Gen 4 Slot and

willie nelson slot machine BUT you go buy the off brand no name cheaper 1TB Gen 4 NVME for lets say, 70$ (6-7K read