Attn: AGP Interfaces and Signaling Voltages

[minsonngo]

There are three versions of the AGP specifications, as follows:

AGP1.0
AGP1.0 specifies an interface that supports 1X and 2X speeds with 3.3V signaling and a keyed 3.3V connector. AGP1.0 supports DIME, pipelined transactions, source-synchronous clocking, texturing, and sidebanding.

AGP2.0
AGP2.0 specifies an interface that supports 1X, 2X, and 4X speeds with 1.5V signaling. AGP2.0-compliant interfaces and adapters may use either a 1.5V keyed connector, which accepts only 1.5V devices, or a universal connector, which accepts 1.5V or 3.3V devices interchangeably. AGP2.0 adds Fast Writes to the protocols supported by AGP1.0.

AGP3.0
AGP3.0 specifies an interface that supports 4X and 8X speeds with 0.8V signaling. AGP3.0 uses the same 1.5V keyed connector or universal connector used by AGP2.0. AGP3.0 adds several protocol elements to those supported by AGP2.0, and removes support for some AGP2.0 features.

There are six types of AGP interfaces, and six corresponding types of AGP adapters, as follows:

AGP3.3V
AGP3.3V interfaces and adapters support 1X or 2X operation at 3.3V only, using a 3.3V connector. An AGP3.3V adapter can be installed in an AGP3.3V, UAGP, or UAGP3.0 interface. An AGP3.3V interface accepts an AGP3.3V, UAGP, or UAGP3.0 adapter.

AGP1.5V
AGP1.5V interfaces and adapters support 1X 2X, or 4X operation at 1.5V only, using a 1.5V connector. An AGP1.5V adapter can be installed in an AGP1.5V, UAGP (described next), U1.5VAGP3.0, or UAGP3.0 interface (the latter two described later in this list). An AGP1.5V interface accepts an AGP1.5V, U1.5VAGP3.0, or UAGP3.0 adapter.

Universal AGP (UAGP)
Universal AGP (UAGP) interfaces and adapters support 1X, 2X, or 4X operations at 3.3V or 1.5V, using a universal connector. A UAGP adapter can be installed in an AGP3.3V, AGP1.5V, UAGP, U1.5VAGP3.0, or UAGP3.0 interface. A UAGP interface accepts AGP3.3V, AGP1.5V, UAGP, U1.5VAGP3.0, or UAGP3.0 adapter.

AGP3.0
AGP3.0 interfaces and adapters support 4X or 8X operations at 0.8V only, using a 1.5V connector. An AGP3.0 adapter can be installed in an AGP3.0, U1.5VAGP3.0, or UAGP3.0 interface. An AGP3.0 interface accepts an AGP3.0, U1.5VAGP3.0, or UAGP3.0 adapter.

Universal 1.5V AGP3.0 (U1.5VAGP3.0)
Universal 1.5V AGP3.0 (U1.5VAGP3.0) interfaces and adapters support 1X, 2X, 4X, or 8X operation at 1.5V or 0.8V, using a universal connector. A U1.5VAGP3.0 adapter can be installed in any AGP interface except the AGP3.3V interface. A U1.5VAGP3.0 interface accepts any AGP adapter except AGP3.3V adapters.

Universal AGP3.0 (UAGP3.0)
Universal AGP3.0 (UAGP3.0) interfaces and adapters support 1X, 2X, 4X, or 8X operation at 3.3V, 1.5V, or 0.8V, using a universal connector. A UAGP3.0 adapter can be used in any AGP interface. A UAGP3.0 interface supports any AGP adapter.

[colbell]

How can i tell what Voltage my card will work on?
It's a Sparkle Geforce4 TI4200 8x, and I'm currently deciding to upgrade my mobo, but some mobos say they'll only accept an 8x card at 1.5v
Will my card work on such a board?

[minsonngo]

The video card should work fine in your motherboard.

AGP3.0
AGP3.0 interfaces and adapters support 4X or 8X operations at 0.8V only, using a 1.5V connector. An AGP3.0 adapter can be installed in an AGP3.0, U1.5VAGP3.0, or UAGP3.0 interface. An AGP3.0 interface accepts an AGP3.0, U1.5VAGP3.0, or UAGP3.0 adapter.

[minsonngo]

Basically any 8X video card will work in any motherboard that has support for 8X video cards.

[colbell]

Cool, thanks for the info, It'll put my mind at rest knowing I don't have to worry about voltages.

[Floppyman]

Excellent info!

[Joeberg]

Thanks for the info