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
    DID YOU KNOW?
    It's Happening Now: Perceptual Computing is Real

    Perceptual computing is the ability for a computer to recognize what is going on around it. More specifically, the computer can perceive the... Read More »

    Apple Pay Promises to Strengthen Payment Security

    Experts believe that Apple Pay and other competitive payment systems will be far more secure than cards, even cards equipped with EMV chips. Read More »

    The Great Data Storage Debate: Is Tape Dead?

    Tape clearly is on the decline. But remember, legacy systems can hang for a shockingly long time. Read More »

    QUICK REFERENCE
    Network Fundamentals Study Guide

    A network is a group of two or more computer systems or devices, linked together to share resources, exchange files and electronic communications.... Read More »

    Computer Architecture Study Guide

    This Webopedia  study guide describes the different parts of a computer system and their relations. Read More »

    Webopedia Polls

    The trend for the past two years has been for shoppers to spend more online during the holiday season. How do you typically shop for holiday... Read More »