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Definition: AGP

(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 Introduced in 1997 and superseded by PCI Express in the late 2000s, a single AGP slot on the motherboard provided a direct connection between the card and memory.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.