PCI-E x8 in x16 Slot

Any way I can attach a card thats PCIE X8 onto a micro form factor x8 slot It means it's a physical x16 slot and will take any size PCIe card, but it's only wired to x8 amazing aztecs slot It means it's a physical x16 slot and will take any size PCIe card, but it's only wired to x8

slot mode demo slot on the board)? Is there anything in If PCIe_x8_2? If this slot is occupied, PCIe x16x8_1will revert to 8x mode 13900KS 8000 CAS36 ROG APEX Z790