Can I plug an M2 to a PCIe Gen3X4 slot?

Can I plug an M2 to a PCIe Gen3X4 slot? m 2 slot with pcie x4 lanes As I said in the topic tittle I would like to know if there is a way to check how many Physical Pcie lanes my supports , m2 slot screw PCIe is backwards compatible to the previous generations A PCIe Gen 2 card will work an a Gen 4 slot at Gen 2 speeds However, 4 PCIe lanes

m2 slot screw Now I am also using a GTX 1050 TI GPU with it So if I Install a NVME SSD, as far as I know that B450 mobo dont have its own PCIE x4

m2 pcie 40 in 30 slot 2 slots with x4 PCIE lanes each  This allows for devices from 2242 to 22110 in both SATA and PCIe mode, with the latter supporting PCIe x4 drives in AHCI or NVMe modes