How to Determine the Voltage of an AGP Video Card
AGP (Accelerated Graphics Port) is all but dead today, with PCIe (Peripheral Component Interconnect Express) being its successor. However, there are still plenty of systems in use that have AGP slots, and some video card manufacturers still produce AGP-based video cards. It is possible that an older machine may be come across for which information on its AGP compatibility cannot readily be found.
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Instructions
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Place the motherboard in front of you with the port side facing to your left. This should put the part of the motherboard with all of the slots nearest you.
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Look at the AGP slot. If it has a single notch closer to the left of the slot, then is it an AGP 1x/2x slot and is 3.3-volt. If it has a single notch closer to the right of the slot, it is an AGP 2x/4x slot and is 1.5-volt. If it has no notches, then it is a universal AGP slot, capable of both 3.3-volt and 1.5-volt signaling and can handle all types of AGP cards.
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Look at the video card. Orient it so that its back plate is at your left with the component side facing you. If it has a notch in the card that is closer to the front of the card, or your right, it is a 1.5-volt signaling card. If the notch is closer to the back plate, then it is an older card, and is 3.3-volt. The newest AGP cards had both notches, which mean that technically, they could be used in any AGP slot.
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