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0.8v (newer) - 8X
1.5v (older) - 4X
3.3v (oldest) - 2X
2X and 4X AGP
Older 2X AGP cards do not use the right voltage to function properly in the newer 1.5V AGP slots. If forced into a 1.5V AGP slot, a non-1.5V compliant video card will damage the motherboard. On the other hand a 1.5V AGP card is usually backwards compatible with older 2X AGP slots.
Motherboards supporting 8x AGP support both 1.5V AGP 2.0 compliant cards (AGP 4x) and newer .8V AGP 3.0 compliant cards (AGP 8x). The keying for AGP 3.0 cards is identical to that of AGP 2.0 cards to retain backward compatibility.
More information and pictures can be found on ATI's Website.
When installing an AGP video card: If it doesn't fit in the correct direction, don't force it!