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Accelerated Graphics Port
The Accelerated Graphics Port (often shortened to AGP) is a high-speed point-to-point channel for attaching a video card to a computer system, primarily to assist in the acceleration of 3D computer graphics. It was originally designed as a successor to PCI-type connections for video cards. Since 2004, AGP has been progressively phased out in favor of PCI Express (PCIe); by mid-2008, PCI Express cards dominated the market and only a few AGP models were available.〔(【引用サイトリンク】title=AGP almost at the end, Softpedia )〕
== Advantages over PCI ==
As computers increasingly became graphically oriented, successive generations of graphics adapters began to push the limits of PCI, a bus with shared bandwidth. This led to the development of AGP, a "bus" dedicated to graphics adapters.
The primary advantage of AGP over PCI is that it provides a dedicated pathway between the slot and the processor rather than sharing the PCI bus. In addition to a lack of contention for the bus, the direct connection allows for higher clock speeds. AGP also uses sideband addressing, meaning that the address and data buses are separated so the entire packet does not need to be read to get addressing information. This is done by adding an extra 8-bit "SideBand Address" bus that allows the graphics controller to issue new AGP requests and commands at the same time other AGP data is flowing through the main 32 address/data (AD) lines. This results in improved overall AGP data throughput.
In addition, to load a texture, a PCI graphics card must copy it from the system's RAM into the card's video memory, whereas an AGP card is capable of reading textures directly from system RAM using the graphics address remapping table (GART), which reapportions main memory as needed for texture storage, allowing the graphics card to access them directly.〔(【引用サイトリンク】title=What is AGP? )〕 The maximum amount of system memory available to AGP is defined as the ''AGP aperture''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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