agp slot The Accelerated Graphics Port (also known Advanced Graphics Port, AGP in short) is a high-speed point-to-point channel for attaching a video card to a computer’s motherboard, primarily to assist in the acceleration of 3D computer graphics. The primary advantage of AGP over PCI is that it provides a dedicated pathway between the slot and the processor rather than sharing the PCI bus.

There are some version of AGP in markets:

AGP 1x A 32-bit channel operating at 66 MHz resulting in a maximum data rate of 266 megabytes per second (MB/s), doubled from the 133 MB/s transfer rate of PCI bus 33 MHz / 32-bit; 3.3 V signaling.
AGP 2x A 32-bit channel operating at 66 MHz double pumped to an effective 133 MHz resulting in a maximum data rate of 533 MB/s; signaling voltages the same as AGP 1x.
AGP 4x A 32-bit channel operating at 66 MHz quad pumped to an effective 266 MHz resulting in a maximum data rate of 1066 MB/s (1 GB/s); 1.5 V signaling;
AGP 8x A 32-bit channel operating at 66 MHz, strobing eight times per clock, delivering an effective 533 MHz resulting in a maximum data rate of 2133 MB/s (2 GB/s); 0.8 V signaling.

Find more information about AGP Interface Video Card and here:
- http://pinouts.ru/Slots/agp_pinout.shtml
- http://en.wikipedia.org/wiki/Accelerated_Graphics_Port
- http://www.interfacebus.com/Design_Connector_AGP.html
- http://www.playtool.com/pages/vidslots/slots.html

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