PC AGP Video Bus Slot Pinout Version 3.0

The pinout table below provides the 8x Pin out for the AGP bus slot on the personal computer. The pinouts listed account for version 3.0 of the AGP specification. The table lists 132 pins [2 rows of 66 pins], but the Key which is listed is an absence of pins [space], both the Motherboard slot connector and AGP card have 124 pins. The table lists pinouts for a 1.5 volt connector; for Universal AGP3.0 and AGP3.0 Mother Board connectors..

Refer to this page for [obsolete] Version 2.0 of the AGP specification; 1x, 2x, 4x pin out at 3.3v or 1.5 volts, with different Key locations.

The AGP slot connector is 2.9 inches long. The number sign in the pinout table indicates that 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 PWB width is .062 inches.

The Accelerated Graphics Port [AGP] is a Point-to-Point [Chip-to-Chip] bus using 1.5 Volt or 3.3V signaling [depending on the version]. 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] spec, using the PCI specification as an operational baseline. So the pinout is similar between the PCI bus and AGP video bus. The AGP specification adds 20 additional signals not included in the original PCI bus standard. The AGP specification defines the Protocol, Electrical and Mechanical aspects of the interface 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 [AGP Board]. The Board 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 Slot is being replaced by the PCI-Express Bus (which is not mechanically interchangeable with the AGP slot). However many AMD boards are still shipping with AGP slots.

The pins defined as reserved in revision 2.0 are defined in revision 3.0 of the AGP specification.

AGP 3.0 Card Pinout
Pin # Side A Side B
3 GC_DET# 5.0V
11 MD_DET# ST2
22 Reserved Reserved
24 Reserved 3.3V AUX
34 Vddq1.5 Vddq1.5
40 Vddq1.5 Vddq1.5
42 Key
43 Key
44 Key
45 Key

The pin out defined in revision 3.0 of the AGP is basically the same as found in revision to with only a few differences.
So rather than duplicate the entire pin out, I only list the changes from the AGP 2.0 Pin out, because there were so few.
Both A/B sides of the connector are listed even when only when one changed.
Primarily the pins that were reserved under version 2.0 are now being used, as well as the positions not used by the key.
Any pins defined as reserved under version 3.0 of course will never be used as work on the standard has stopped.

Additional computer bus descriptions and pin out information may be found by selecting the Buses icon below.
Main Accelerated Graphics Port [AGP] Bus page.

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

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Modified 6/13/15
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