AGP Accelerated Graphics Port A dedicated graphics bus slot on PC motherboards. Designed by Intel, AGP operates at 66 MHz and transfers data at a rate up to 528 MB/sec. By comparison, the PCI slot that most graphics cards currently use runs at 33 MHz and has a maximum transfer rate of 132 MB/sec. AGP's greater bandwidth will allow game and 3D application developers to store and retrieve larger, more realistic textures in system memory rather than video memory, without incurring a dramatic performance hit. See also: PCI, sideband addressing