KONYEAD x16 to m-Key nvme x 4 ssd Expansion

Is my Samsung 980 PRO NVMe running in PCIe 3 or PCIe 4 nvme 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 nvme slot types PCIe doubles the throughput rate per lane, giving users a transfer rate of up to 64GBs Why does this matter? The faster the throughput

nvme pcie 40 in 30 slot Kinda odd he spent nearly 4 minutes talking about the difference between Gen 3 and Gen 4