My Graphics card will not fit in my motherboards PCIe slot

PCIE - mm PCI Express® Gen 3 Edge Card Connector pcie slot dimensions 4 x PCI Slot : signal via golden finger 3 x : 1 x A Key 1 x B Key w SIM holder (with PCIe pcie 4 in pcie 3 slot ssd The Matrox PCI and PCIe technology guide explores the importance of evaluating different slot types when buying add-in graphics cards

pcie 4 card in pcie 3 slot A slot graphics card is about 4 cm wide, slot is around cm wide, and cards have a width of around 5 cm Will , , and