AGP Pinout, PC Video Bus Slot

The pin out table below provides the Pinout for the AGP bus slot on the personal computer. The table lists 132 pins, but the Key pins which are listed is an absence of pins [space],
both the Motherboard slot connector and AGP card has 124 pins. The AGP bus connector is 2.9 inches long.
The number sign in the pinout table below refers to: "the signal’s asserted state occurs when it is at a low voltage.
The absence of a # symbol indicates that the signal is asserted at a high voltage. The standard board width is .062.

The pinout table below represents version 1 of the AGP specification, links to revision 2 and 3 are listed on the main AGP page.
Both Revision 1 [2x speed] and revision 2 [4x speed] are obsolete being replaced by revision 3 [which specified 8x speeds].

AGP [Accelerated Graphics Port] is a Point-to-Point [Chip-to-Chip] bus using 1.5 Volt or 3.3V signaling. The main use of the AGP bus is as a Local Video bus in IBM compatible Personal Computers [PCs]. The AGP bus is based on the PCI [Peripheral Component Interface] standard, using the PCI specification as an operational baseline. So the AGP pinout is similar to the PCI bus pinout. The AGP specification adds 20 additional signals not included in the PCI bus. The AGP specification defines the Protocol, Electrical and Mechanical aspects of the bus. The AGP bus is used as a local video bus in Personal Computers [PCs].

The Mechanical definitions include a connector and Add-in card. The AGP Card sizes and 1.5v and 3.3v connectors are also defined with in the spec. There are five connectors defined: AGP 3.3v, AGP 1.5v, AGP Universal, AGP Pro Universal, AGP Pro 3.3v, and AGP Pro 1.5v. PCI and AGP boards are not mechanically interchangeable.

Note: On the newest Motherboards the AGP video Slot is being replaced by the PCI-Express Bus (which is not mechanically interchangeable with the AGP slot).

Back to the main Accelerated Graphics Port [AGP] Bus page.
Additional computer bus descriptions and pinout information may be found by selecting the Buses icon below.

Navigation: Engineering Home > Interface Buses > Personal Computer Buses > AGP Bus > AGP Pin Out.

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