AGP is little more than a second PCI bus running at higher clock speeds. Because PCI was a shared bus, not only did the video card have to share bandwidth with

AGP is little more than a second PCI bus running at higher clock speeds. Because PCI was a shared bus, not only did the video card have to share bandwidth with every other card, but PCI ended up stuck at the original 33mhz speeds of the first version for compatibility reasons.