Why would a PCIe x16 slot be limited to PCIe x1 card?

Full Size GPU into PCIe x1 Slot The Easy Way! pciex1 slot No, it is not possible to use a PCIe x16 card in a PCIe x1 slot The physical design and specifications of a PCIe x16 card are different from a pciex16 slot I cut open the back of a x1 slot on my motherboard to allow me to fit a full size GPU

pciex16 slot configuration What happens is that if you have disabled onboard LAN, the upper pcie x1 slot stops workingdetecting cards, and this change also seems to brick