PCIE x1 card in PCIE x16 slot?

What Are PCIe Slots Used For? - Devices and Expansion can you put a pcie x1 in a x16 slot I cut open the back of a x1 slot on my motherboard to allow me to fit a full size GPU cannonade! slot Here's the best way I've found and seen of modifying a PCIE x1 slot to fit a full-sized x16 card

can you put a pcie x4 in a x16 slot The card will work in an x16 physical slot But if that x16 slot is the primary graphics card slot, why would you want to put a