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

Question - PCIe or PCIe nvme pcie 4 0 in 3 0 slot 2 Slot is from the Ryzen 7 5700G then it will only support PCIe Found this tech site that explains that a Motherboard can have both PCIe and slots nvme gen 4 in gen 3 slot 2 slot directly below the CPU support the faster gen 4 NVMe cards? I'm assuming the second is gen 3 Specs say the

nvme slot Or the next generation of GPUs benefits from the doubled throughput of PCIe and slots (Note that PCIe devices will also work normally on a PCIe