Accelerated Graphics Port

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accelerated graphics port

[ak‚sel·ə‚rād·əd ′graf·iks ‚pȯrt]
(computer science)
A personal computer graphics bus that transfers data at a greater rate than a PCI bus.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Accelerated Graphics Port

(hardware, graphics)
(AGP) A bus specification by Intel which gives low-cost 3D graphics cards faster access to main memory on personal computers than the usual PCI bus.

AGP dynamically allocates the PC's normal RAM to store the screen image and to support texture mapping, z-buffering and alpha blending.

Intel has built AGP into a chipset for its Pentium II microprocessor. AGP cards are slightly longer than a PCI card.

AGP operates at 66 MHz, doubled to 133 MHz, compared with PCI's 33 Mhz. AGP allows for efficient use of frame buffer memory, thereby helping 2D graphics performance as well.

AGP provides a coherent memory management design which allows scattered data in system memory to be read in rapid bursts. AGP reduces the overall cost of creating high-end graphics subsystems by using existing system memory.

This article is provided by FOLDOC - Free Online Dictionary of Computing (


(Accelerated Graphics Port) An earlier hardware interface from Intel for connecting a graphics card (display adapter) to a PC. Introduced in 1997 and superseded by PCI Express in the late 2000s, a single AGP slot on the motherboard provided a direct connection between the card and memory. AGP was introduced as a higher-speed alternative to PCI, and it freed up a PCI slot for another peripheral device.

The original AGP standard (AGP 1x) provided a data transfer rate of 264 MB/sec. AGP 2x, 4x and 8x increased the rate to 528 MB/sec, 1 GB/sec and 2 GB/sec. See AIMM, PCI Express, PC data buses and motherboard.

AGP and PCI Slots
The brown AGP receptacle sat about an inch farther back from the PCI slots. There was only one AGP slot on the motherboard for the graphics card.

From AGP to PCI Express (PCIe)
The 32-bit AGP bus gave way to 16-channel PCI Express (PCIe). For a while, motherboards had one PCIe slot just for the graphics card. Later on, boards offered multiple PCIe slots.
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