How fast is PCIe NVMe vs PCIe

How fast is PCIe NVMe vs PCIe nvme gen 4 in gen 3 slot 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 slot vs m2 In comparison, PCIe Gen4 operates at 16 GTs, converting to about 2 GBs per PCIe lane PCIe Gen4 is the fourth generation of the PCI Express specification As

nvme slot vs m2 #2 Gigabyte AORUS NVMe Gen4 SSD The most distinctive feature of Gigabyte AORUS NVMe PCIe SSD is the full-body copper heat spreader, which

nvme slot types NVMe slots are backward compatible with previous-gen NVMe drives New NVMe drives will work on older NVMe slots as well However, backward Gen4 x4), 1 ; 2 USB Gen2 , 8 USB Gen1 ; Dragon LAN *Not compatible with AMD Athlon