Which slot on MSI Z490 motherboard supports PCIe ?

PCI Express 5 : Here's everything you need to know about pci 4 ssd in pci 3 slot PCIe Gen 4 is backward compatible, so a PCIe Gen 4 device connected to a PCIe Gen 3 system will function normally at PCIe Gen 3 speeds That means if you pci 4 ssd in pci 3 slot Compared to the older PCI standard, PCIe has various improvements from higher maximum throughput, fewer IO pins, and a smaller form factor

pcie cem slot SATA SSDs and SSDs that use two PCI Express lanes tend to use keys B and M to maximize compatibility, since both connectors can deliver both