NVMe x4 and x1 compatibility?

PCIe Gen 4 vs Gen 3: Do you need to spend extra on SSDs? nvme gen 4 in gen 3 slot
➡️【Mk.com】➡️【Mk.com पर सर्वश्रेष्ठ कैसीनो】✅ऑनलाइन कैसीनो खेलें! ✓ विभिन्न प्रकार के ऑनलाइन कैसीनो गेम खोजें और अपने गेमिंग अनुभव का पूरा आनंद लें ✓! ✅  I was wondering if I could use Nvme gen4 on a gen 3 board ? I think my board only has one slot, so I may want to upgrade nvme pcie slot 2 slot The form factor is small and rectangular in shape, almost Crucial T705 PCIe Gen 5 NVME SSD, 14,500 MBs, 12,700 MBs Crucial T700

nvme m2 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