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AGP Compatibility For Sticklers AGP Compatibility: The Short Version If an card fits in an AGP then they are compatible. But read the rest of this anyway.

There are some rare exceptions where motherboard and video card manufacturers don't obey the rules. AGP Compatibility: The Long Version AGP Basics In 1996, Intel introduced AGP 1.0. AGP was a modified version of designed to speed up transfers to It was followed by AGP 2.0 in 1998 and AGP 3.0 in 2002. Each new version added new speeds and signaling voltages. AGP Version Signaling Voltage Peak Speeds AGP 1.0 3.3 Volts 1X at 267MB/s, 2X at 533MB/s AGP 2.0 1.5 Volts 1X at 267MB/s, 2X at 533MB/s, 4X at 1067MB/s AGP 3.0 0.8 Volts 4X at 1067MB/s, 8X at 2133MB/s The signaling voltage is the voltage used to send data between the AGP card and the AGP You can download the final AGP 3.0 specification from. You may also want to look at the and the AGP Connectors And Slots Each AGP card has one or two slots in its card edge. If a video card has the 3.3 volt slot, then it can use 3.3 volt signaling.

AGP 2.0 added the 1.5 volt slot on cards which could use 1.5 volt signaling. If the card has both slots then it can use both signaling voltages. AGP 3.0 added support for 0.8 volt signaling but it did not add a new kind of slot. If a video card supports either 1.5 volt or 0.8 volt signaling then it has the 1.5 volt slot. The AGP connectors on the motherboard are keyed to prevent insertion of AGP cards which would be damaged if plugged in. An AGP 3.3V motherboard connector can only accept AGP cards which have the 3.3V slot.

If you try to insert a card without a 3.3V slot into an AGP 3.3V motherboard connector, the card will bump into the connector key and cannot be inserted. Likewise an AGP 1.5V motherboard connector can only accept AGP cards with the 1.5V slot. An AGP universal motherboard connector has no keys and therefore can accept any kind of AGP card. An AGP card with both voltage slots can be plugged into any kind of AGP motherboard connector. If you can plug an AGP card into an AGP motherboard connector, then neither the card nor the motherboard will be damaged (assuming they obey the AGP specifications). AGP Pro motherboard connectors were created to support video cards which use more power than a plain AGP connector can supply.

There are extra connectors on both ends of an AGP Pro motherboard connector which allow an AGP Pro video card to draw more power. Plain AGP cards are fully compatible with AGP Pro motherboards, but it doesn't work the other way around. AGP motherboards are not compatible with AGP Pro video cards. High-end motherboards are often actually AGP Pro motherboards because they can accept both AGP cards and AGP Pro cards. But AGP Pro video cards are rarely seen outside the workstation market because they aren't compatible with AGP motherboards. Consumer-oriented video cards which need to draw lots of power usually require you to plug in a disk drive power supply cable.

That way they can be compatible with all motherboards and still use lots of power. Official AGP Compatibility Graphics Card Types (table 16 from the AGP 3.0 specification) Graphics Card Types Connector Type Description AGP 3.3V Card 3.3V slot Supports only 3.3V signaling.

Available speeds 1x, 2x. AGP 1.5V Card 1.5V slot Supports only 1.5V signaling. Available speeds 1x, 2x, 4x. Universal AGP Card Double slotted Supports 3.3V and 1.5V signaling. Available speeds 1x, 2x at 3.3V and 1x, 2x, 4x at 1.5V. AGP 3.0 Card 1.5V slot Supports only 0.8V signaling. Available speeds 4x, 8x.

Universal 1.5V AGP 3.0 Card 1.5V slot Supports 1.5V and 0.8V signaling. Available speeds 1x, 2x, 4x at 1.5V and 4x, 8x at 0.8V. Universal AGP 3.0 Card Double slotted Supports AGP 3.3v, 1.5V, and 0.8V signaling. Available speeds 1x, 2x at 3.3V and 1x, 2x, 4x at 1.5V and 4x, 8x at 0.8V.

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The table above gives Intel's official names for the various kinds of AGP cards allowed by the AGP specifications. Unfortunately, the technical specifications for a video card rarely use these terms properly (if at all) to describe the video card. They usually just list the fastest AGP multipliers it supports: '8X, 4X', or '4X'. From that information and the voltage slots on a picture of the video card, you can often figure out exactly what it is. I've seen plenty of video cards listed as 'AGP 3.0 cards' when in fact they are actually Universal 1.5V AGP 3.0 cards.

I've also seen cards listed as 'AGP 8X,4X 1.5 volt only' when there is really no such thing. What they are trying to tell you is that it's a Universal 1.5V AGP 3.0 Card and doesn't support 3.3 volts. It is required to support 0.8 volts if it supports 8X. Motherboard Types (table 15 from the AGP 3.0 specification) Motherboard Types Connector Type Description AGP 3.3V Motherboard 3.3V keyed Supports only 3.3V signaling. Available speeds 1x, 2x. AGP 1.5V Motherboard 1.5V keyed Supports only 1.5V signaling. Available speeds 1x, 2x, 4x.

Universal AGP Motherboard Universal Supports both 3.3V and 1.5V signaling. Available speeds 1x, 2x at 3.3V and 1x, 2x, 4x at 1.5V.

AGP 3.0 Motherboard 1.5V keyed Supports only 0.8V signaling. Additional electrical ID to prevent 1.5V operation. Available speeds 4x, 8x. Universal 1.5V AGP 3.0 Motherboard 1.5V keyed Supports 1.5V and 0.8V signaling.

Available speeds 1x, 2x, 4x at 1.5V and 4x, 8x at 0.8V. Universal AGP 3.0 Motherboard Universal Supports 3.3V, 1.5V, and 0.8V signaling. Available speeds 1x, 2x at 3.3V and 1x, 2x, 4x at 1.5V and 4x, 8x at 0.8V.

The table above gives Intel's official names for the various kinds of AGP motherboards allowed by the AGP specifications. The technical specifications for motherboards tend to be just as sloppy as they are for video cards. Sometimes they use the official motherboard type names properly and sometimes they do not.

Motherboard And Card Compatibility (table 35 from the AGP 3.0 specification) AGP 3.3V Card AGP 1.5V Card Universal AGP Card AGP 3.0 Card Universal 1.5V AGP 3.0 Card Universal AGP 3.0 Card AGP 3.3V Motherboard Works at 3.3V Won't fit in slot Works at 3.3V Won't fit in slot Won't fit in slot Works at 3.3V AGP 1.5V Motherboard Won't fit in slot Works at 1.5V Works at 1.5V Fits in slot but won't work.