Editing Accelerated Graphics Port (section)

===Unofficial variations===
A number of non-standard variations of the AGP interface have been produced by manufacturers.

====Internal AGP interface====
;Ultra-AGP, Ultra-AGPII: It is an internal AGP interface standard used by [[Silicon Integrated Systems|SiS]] for the north bridge controllers with integrated graphics. The original version supports same bandwidth as AGP 8×, while Ultra-AGPII has maximum 3.2&nbsp;GB/s bandwidth.

====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.

====PCIe based AGP ports====
;AGR: The [[Advanced Graphics Riser]] is a variation of the AGP port used in some PCIe motherboards made by [[Micro-Star International|MSI]] to offer limited backward compatibility with AGP. It is, effectively, a modified PCIe slot allowing for performance comparable to an AGP 4×/8× slot,<ref>{{cite web |url=http://www.pcstats.com/articleview.cfm?articleid=1806&page=2 |title=MSI K8N Neo3-F Motherboard Review—What's an AGR video slot? |access-date=15 September 2014 |archive-url=https://web.archive.org/web/20141110101536/http://www.pcstats.com/articleview.cfm?articleid=1806&page=2 |archive-date=10 November 2014 |url-status=dead }}</ref> but does not support all AGP cards; the manufacturer published a list of some cards and chipsets that work with the modified slot.<ref>{{cite web|url=http://www.msi.com.tw/html/products/mainboard/agr/7135agr.pdf |title=List of cards and chipsets that work with the MSI AGR port |access-date=15 September 2014 |url-status=dead |archive-url=https://web.archive.org/web/20070308180139/http://www.msi.com.tw/html/products/mainboard/agr/7135agr.pdf |archive-date=March 8, 2007 }}</ref>