pci slotThe top slot on your motherboard will typically be the best place to mount your graphics card, as this is most often the slot that runs at the full 16x speed.Learn what PCI slot is, how it works and what are the main types of PCI slot (64-bit, 32-bit, PCI-X and PCI-E). Also, explore the history and evolution of PCI slot from 1992 to 2004.