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AGP video question

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5 replies

by byteside

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If I have a motherboard that has an AGP 2x/4x will a 8x video card work at all, not work properly or recognize that the slot is only 2x/4x and work as a 4x?

5 replies

by thechas

It depends on the video card.

If the card does NOT state that it is 4X compatible, it likely will not work on older systems.

The biggest question is what voltage does the card require, and does your AGP slot supply the correct voltage for the card.

Many 8X AGP cards require 3.3 volt supplies.
Many older motherboards only supply 5 volts to the AGP slot.

Chas

by dmiles

Motherboard and video cards can support multiple AGP modes. It is totally up to the manufacturer which modes are supported. The specs on the motherboard and video card will tell you things like: Supports AGP 2X/4X/8X (1.5V and 0.8V), or Supports AGP 4X/8X (0.8V only). The trick is not to look at the 4X or 8X, because this wont tell you everything. A motherboard that supports 4X (AGP3.0 standard @ 0.8V, which also supports 8X) is not compatible with a video card that supports 4X (AGP2.0 standard @ 1.5V, which also supports 2X). The AGP3.0 spec defines 4X and 8X. The AGP2.0 spec defines 2X and 4X. So just because your motherboard says 4X/8X and your video card says 2X/4X, definetly doesnt mean they'll work together at 4X. (P.S. - AGP1.0 standard defines 1X and 2X @ 3.3V)

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