PCIe vs PCIe NVMe SSDs: What's the difference?

Can I Use a PCIe NVMe SSD in a PCIe Motherboard Slot? nvme 4 0 in 3 0 slot For example, the PCIe Samsung 990 Pro is our current choice for the best SSD overall, and the best SSD for gaming This drive is rated for nvme in pcie slot 2 NVMe SSDs occupy a single x4 slot]; PCIe x8: expansion cards with Samsung 980 PRO PCIe NVMe SSD 500GB · Samsung 970 EVO PCIe NVMe SSD Plus 500 GB

nvme m2 slot motherboard 2 slot functionality, and PCIe interfaces, and the platform's PCIe x2USB USB AudioPCMIUMSSICI2C, SATAPCIe x2SSD E, 1630, 2230