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Brian Cryer's Glossary of IT Terms with Links

AGP

AGP

Advanced Graphics Port. Graphics card interface for high performance graphics (faster than PCI).

Specification	Denoted	Notes
AGP 1.0	AGP AGP x1 AGP x2	Supports 1x and 2x adapter cards. Uses a signal level of 3.3 volts. AGP 1.0 adapter cards have a different slot arrangement from AGP 2.0 (and later) and therefore an AGP 1.0 adapter card will not fit into an AGP 2.0 slot.
AGP 2.0	AGP x4	Supports 4x adapter cards, i.e. 4 times faster than the original AGP specification. Uses a signal level of 1.5 volts.
AGP 3.0	AGP x8	Supports 8x adapter cards. Uses a signal level of 0.8 volts. The slot for AGP 3.0 is identical to that for AGP 2.0. AGP 2.0 and AGP 3.0 cards and motherboards should be compatible with each other - but an AGP 8x card fitted to a motherboard that only supports AGP 4x will be forced to work at the slower 4x rate.

Relevant links:

www.sysopt.com/agp.html - Shows benefits of AGP over PCI.
www.directron.com/15agpguide.html - Provides differences between 1.5V AGP and 0.8V AGP cards.
http://support.intel.com/support/motherboards/desktop/sb/CS-009010.htm - Intel article showing the different pin and slot arrangement for 1.5V and 0.8V AGP cards.
www.supermicro.com/TECHSUPPORT/FAQs/AGP_Pro.htm
www.agpforum.org - Implementers forum.

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