Accelerated Graphics Port Interface Specification

AGP3.0 Interface Specification

Rev. 1.0

2.4.2 AGP3.0/AGP2.0 Compatibility

AGP3.0 and AGP2.0 use the same connector and signal interface with a few additions. This means that

in addition to the configurations allowed in the AGP specification, several new ones are created. The

following tables define the various motherboard and card types that will be considered in this section.

Table 15: Motherboard Options

Motherboard Types Connector Type Description

AGP 3.3 V Motherboard 3.3 V keyed Supports only AGP 3.3 V signaling. Available speeds 1x, 2x.

AGP 1.5 V Motherboard 1.5 V keyed Supports only AGP 1.5 V signaling. Available speeds 1x, 2x,

4x.

Universal AGP Motherboard

(UAGP)

Universal (UAGP) Supports both AGP 1.5 V and 3.3 V signaling. Available

speeds 1x, 2x, 4x.

AGP3.0 Motherboard 1.5 V keyed Supports only AGP3.0 signaling. Additional electrical ID to

prevent AGP 1.5 V operation. Available speeds 8x, 4x.

Universal 1.5V AGP3.0

Motherboard (Universal 1.5V

AGP3.0)

1.5 V keyed Supports AGP 1.5 V and AGP3.0 signaling. Available speeds

1x, 2x, 4x, in AGP2.0 mode and 8x, 4x in AGP3.0 mode.

Universal AGP3.0 Motherboard

(Universal AGP3.0)

Universal (UAGP) Supports AGP 3.3V, 1.5V and AGP3.0 signaling. Available

speeds 1x, 2x, 4x in AGP2.0 mode and 8x, 4x in AGP3.0

mode. This includes 3.3V support for 1x and 2x speeds.