Both the AGP slot on the motherboard and AGP video card must signal at the same voltage to function. Different speeds require different signalling voltages for operation. For example, AGP 8x signals at 0.8V, while AGP 1x can signal at 1.5V or 3.3V. Physical keys in the connector and slot dictate which signalling voltages the devices is capable of operating at. Speed Signalling Voltage:
1x/2x 1.5V or 3.3V
4x 0.8V or 1.5V
8x 0.8V "
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