AGP and PCI are both types of bus connector - the means by which data travels between your computer's graphics card and motherboard.
PCI
Short for Peripheral Component Interconnect, PCI was designed by Intel in the early 1990s and is used by all peripheral devices that connect to the motherboard. Therefore, a PCI graphics card has to share bandwidth with other peripherals, like the sound card and the network interface card. The conventional PCI bus has a data transfer rate of 133 megabytes per second (MB/s), although some PCI variants offer faster rates.
AGP
Short for Accelerated Graphics Port, AGP is an advanced port designed for Video cards and 3D accelerators. Designed by Intel in 1997, AGP introduces a dedicated point-to-point channel so that the graphics controller can directly access the system memory and does not have to share its bandwidth with other peripherals. Most motherboards support AGP, and the bandwidth capabilities are higher than those of PCI. Newer versions of AGP have increased data transfer rates.
* AGP 1x - 266 MB/s
* AGP 2x - 533 MB/s
* AGP 4x - 1066 MB/s
* AGP 8x - 2133 MB/s
PCI Express
PCI Express is a high speed interface that has replaced AGP on some motherboards, and is used by many new graphics cards. PCI Express currently has a data transfer rate of 2.5 GB/s, and newer versions are intended to offer rates of 5 or 10 GB/s.
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Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.