Editing Accelerated Graphics Port (section)

====PCI-based AGP ports====
;AGP Express: Not a true AGP interface, but allows an AGP card to be connected over the legacy [[Peripheral Component Interconnect|PCI bus]] on a [[PCI Express]] motherboard. It is a technology used on motherboards made by [[Elitegroup Computer Systems|ECS]], intended to allow an existing AGP card to be used in a new motherboard instead of requiring a PCIe card to be obtained (since the introduction of PCIe graphics cards few motherboards provide AGP slots). An "AGP Express" slot is basically a PCI slot (with twice the electrical power) with an AGP connector. It offers backward compatibility with AGP cards, but provides incomplete support<ref>{{cite web|url=http://www.ecs.com.tw/ECSWeb/Support/agp.aspx?MenuID=0&LanID=0 |archive-url=https://web.archive.org/web/20051216142008/http://www.ecs.com.tw/ECSWeb/Support/agp.aspx?MenuID=0&LanID=0 |url-status=dead |archive-date=16 December 2005 |title=ECS Web Site |access-date=15 September 2014 }}</ref> (some AGP cards do not work with AGP Express) and reduced performance—the card is forced to use the shared PCI bus at its lower bandwidth, rather than having exclusive use of the faster AGP.
;AGI: The ASRock Graphics Interface (AGI) is a proprietary variant of the Accelerated Graphics Port (AGP) standard. Its purpose is to provide AGP-support for ASRock motherboards that use chipsets lacking native AGP support. However, it is not fully compatible with AGP, and several video card chipsets are known not to be supported.
;AGX: The [[EPoX]] Advanced Graphics eXtended (AGX) is another proprietary AGP variant with the same advantages and disadvantages as AGI. User manuals recommend not using AGP 8× ATI cards with AGX slots.
;XGP: The [[Biostar]] Xtreme Graphics Port is another AGP variant, also with the same advantages and disadvantages as AGI and AGX.