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

How to determine from command line if NVMe slot is gen 3 or gen 4? nvme 4 0 in 3 0 slot 2 SSDs : 80x22mm, 60x22mm and 42x22mm, 30x22mm Hardware Requirement: Available PCI-ex1 slot, or PCI-e x4x8x16 Slot on Mainboard nvme slot This would be like similar data rate to if a x32 PCIE slot existed, which we can safely say is overkill for gaming scenarios 2 NVMe PCIe

nvme in pcie slot vs PCIe Bandwidth For example, a GPU has traditionally utilized 16 lanes, while PCIe NVMe drives would consume an additional four lanes