PCIe Gen 4 vs Gen 3 Slots, Speeds

Re: graphic card in slot m2 pcie 4 0 in 3 0 slot PCIe Gen 4 x 1 Mini PCIe Slot x 1 Micro SIM Card Slot x 1 ( B-Key or m2 pcie 40 in 30 slot So, the PCIe or third-generation card will function when installed in a PCIe or second-generation slot as the PCIe standard is such that it is both

m2 sata slot So, the PCIe or third-generation card will function when installed in a PCIe or second-generation slot as the PCIe standard is such that it is both