What kind of expansion slot should you use for your video card?

Usually, a graphics card comes in the form of a printed circuit board which is to be inserted into an expansion slot Others may have

An additional 16-lane PCI Express slot is occupied by the graphics card in the default configurations System Name PCI Express Slots Power Macintosh G5 Dual

gpu stuck in pcie slot Usually, a graphics card comes in the form of a printed circuit board which is to be inserted into an expansion slot Others may have

gpu slot width From what I gathered in my motherboard's manual, both PCI 1 and PCI 3 slots are PCIe x16 slots, which seems to match my GPU However, in