MPG Z790 EDGE WIFI - question about nvme and pcie

PCIe NVMe Gen3 vs Gen4 nvme gen 4 in gen 3 slot 2 slots I'm looking to add 2 pcie gen 4 nvme SSDs I assume one drive will use one of the x16 lanes And the graphics card nvme pcie slot Testing and installing a Gen4 NVME SSD on a Gen3 Motherboard This includes Unboxing

nvme m2 slot laptop There seem to be some Gen 4 x4 NVMe 2230 M 1) The HAT is Gen 3 and I read that Gen 4 is backwards compatible, but at Gen 3 speeds Are Gen4 drives backwards