PCIe m2 SSD in notebook: speeds and general compatibility

CPU - Current Gen4PCIe GPU on x4 - m2 pcie 4 0 in 3 0 slot The card physically has an X4 interface, so it could be plugged into an X4, X8, or X16 slot It can still physically only access 4 lanes (else m2 slot types Also I'm wondering for eGPU's I have found to physical 16x pcie slot adapter and I'm assuming hardware will show up in due time I

m2 sata slot As the subsequent iteration of Gen3, Gen4's data transfer rate is twice that of PCIe Gen 3, enabling PCIe Gen 4 devices to transfer data at a faster speed PCIe