Webopedia on Google+Webopedia on TwitterWebopedia on FacebookTech Bytes Blog
Main » TERM » A »

AGP

Short for Accelerated Graphics Port, an interface specification developed by Intel Corporation. AGP is based on PCI, but is designed especially for the throughput demands of 3-D graphics. Rather than using the PCI bus for graphics data, AGP introduces a dedicated point-to-point channel so that the graphics controller can directly access main memory. The AGP channel is 32 bits wide and runs at 66 MHz. This translates into a total bandwidth of 266 MBps, as opposed to the PCI bandwidth of 133 MBps. AGP also supports two optional faster modes, with throughputs of 533 MBps and 1.07 GBps. In addition, AGP allows 3-D textures to be stored in main memory rather than video memory.

AGP has a couple important system requirements:

  • The chipset must support AGP.
  • The motherboard must be equipped with an AGP bus slot or must have an integrated AGP graphics system.
  • The operating system must be the OSR 2.1 version of Windows 95, Windows 98 or Windows NT 4.0. And currently, many professional Macintoshes support AGP.
  • AGP-enabled computers and graphics accelerators hit the market in August, 1997. However, there are several different levels of AGP compliance. The following features are considered optional:

  • Texturing: Also called Direct Memory Execute mode, allows textures to be stored in main memory.
  • Throughput: Various levels of throughput are offered: 1X is 266 MBps, 2X is 533 MBps; and 4X provides 1.07 GBps.
  • Sideband Addressing: Speeds up data transfers by sending command instructions in a separate, parallel channel.
  • Pipelining: Enables the graphics card to send several instructions together instead of sending one at a time.
  • Also see Understanding Video and Graphics Adapters  in Webopedia's "Did You Know...?" section.







    TECH RESOURCES FROM OUR PARTNERS
    LATEST ARTICLES
    Slideshow: 5 Hot Holiday Gifts for Tech Enthusiasts

    From cute electronic toys to VR gaming, here are 5 hot gifts to give to your special tech enthusiast this holiday season. Read More »

    What's Hot in Tech: AI Tops the List

    Like everything in technology, AI touches on so many other trends, like self-driving cars and automation, and Big Data and the Internet of Things... Read More »

    DevOp's Role in Application Security

    As organizations rush to release new applications, security appears to be getting short shrift. DevSecOps is a new approach that holds promise. Read More »

    STUDY GUIDES
    Java Basics, Part 1

    Java is a high-level programming language. This guide describes the basics of Java, providing an overview of syntax, variables, data types and... Read More »

    Java Basics, Part 2

    This second Study Guide describes the basics of Java, providing an overview of operators, modifiers and control Structures. Read More »

    The 7 Layers of the OSI Model

    The Open System Interconnection (OSI) model defines a networking framework to implement protocols in seven layers. Use this handy guide to compare... Read More »