4th gen SSD on B450 motherboard?

What are the Differences between Gen4 and Gen3 PCIe SSDs? m2 pcie 4 0 in 3 0 slot My questions are: 1 Is the PCI-E NVME SSD compatible with my Z390 Godlike MOBO which has PCI-E slots? 2 m2 slot pc As with previous generations, the standard simply doubles the speed that the PCIe slot runs at It now provides about 2GBs per lane

m2 pcie 40 in 30 slot NVMe SSD to PCIe x4 Mobile RackBackplane with Removable Tray for PCI Express Expansion Slot, Tool-less Installation, PCIe Hot-Swap Drive Bay, Key