CPU & PCIe lanes - Confused af halp plz?

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

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

m2 pcie 40 in 30 slot 2 NVMe socket is described as being connected to the CPU via PCIe x4x2, the second NVMe socket is described as being connected to the

m2 sata vs nvme slot 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 ,