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The AGP connector installed on many Pentium® 4 processor-based Desktop Boards is keyed for 1.5V AGP cards only.
The AGP connector is not mechanically compatible with 3.3V AGP cards. To some the 1.5V AGP connector may appear backwards due to the connector key being exactly the opposite of the 3.3V AGP connector.
AGP 2x/4x Universal Graphics card with AGP 1.5 Volt slot

AGP 2x Graphics card with AGP 1.5 Volt slot

AGP is a high-performance interface for graphics-intensive applications, such as 3D applications. While based on the AGP Local Bus Specification, Rev. 2.1, AGP is independent of the PCI bus and is intended for exclusive use with graphical display devices.
This applies to:
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