Can I Use a PCIe NVMe SSD in a PCIe Motherboard Slot?

Can I Use a PCIe NVMe SSD in a PCIe Motherboard Slot? pci 4 in pci 3 slot Max Bandwidth x16 Slot: 4 GBs , 4 GBs ; Notable for being the first generation of PCIe, introducing higher speeds than the previous PCI interface pcie 4 card in pcie 3 slot PCI Express

pcie 4 card in pcie 3 slot I have recently bought a B450 mobo, and it comes with CrossFire support The thing is, only one of the PCIe slot is x16, the other one is x4 I have a

pcie2 slot 4 · 2 Graphics Interface PCIe · PCIe · PCIe PCIe x 16 Slots 7 · 6 · 5 · 4 SuperSpeed Storage：3*PCIe Connectors; EZ-Latch：PCIe PCI Express and , this, in order to see how much RX 7600