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

What does the X4 mean in an PCIe Gen X4 NVME drive? nvme m 2 slot Supports AMD Socket AM5 Ryzen™ 9000, 8000 and 7000 Series Processors; 8+2+1 Power Phase, ; 2 x DDR5 DIMMs, Supports Dual Channel, up to 7200+ ; nvme m2 slot laptop 2 NVMe SSDs are a good choice for hard drive-intensive workloads or workloads that require many hard drive reads and writes This was last updated in June 2023

nvme pcie slot 2 drives are “keyed” at one end so as to prevent the end-user from inserting them in an incompatible socket PCIe NVMe drives are 'M' keyed SATA ones,