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 I'd really like to have 1 PCIe x8 Gen 5 slot + 2 PCIe x8 Gen 4 slot + 3 PCIe x4 Gen 3 slots on such a backplane at the same time for instance pci 4 ssd in pci 3 slot Shop 4 x PCI Express x16 Intel Motherboards on Watch for amazing deals and get great pricing

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