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Accelerated Graphics Port
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Accelerated Graphics Port
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==Advantages over PCI== As computers increasingly became graphically oriented, successive generations of graphics adapters began to push the limits of [[Peripheral Component Interconnect|PCI]], a [[computer bus|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 bus|address]] and [[data bus]]es are separated so the entire packet does not need to be read to get addressing information. This is done by adding eight extra 8-bit [[computer bus|buses]] which allow the graphics controller to issue new AGP requests and commands at the same time with other AGP data flowing via 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]], which reapportions main memory as needed for [[Texture mapping|texture]] storage, allowing the graphics card to access them directly.<ref>[http://www.sysopt.com/features/mboard/article.php/3549951 What is AGP?], SysOpt, September 19, 2003.</ref> The maximum amount of system memory available to AGP is defined as the AGP [[Aperture (computer memory)|aperture]].
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