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AGP, AGP 1x, AGP 2x, AGP 4x, AGP 8x

AGP standards for Accelerated Graphics Port or Advanced Graphics Port. The high-speed interface has been in use for years, and was developed for motherboards to attach graphics cards and assist in 3D graphics acceleration. While the AGP port provided significant improvements when it was brought to the market (over PCI), it is currently being largely phased out for the PCI-Express (PCI-e) interface. Regardless, motherboards and graphics cards still are available that use the AGP standard.

Since it was first published by Intel in 1997 (spec. 1.0), it has evolved considerably. Speeds of 1x, 2x, 4x and 8x have been specified over spec. v2.0 and spec. v3.0 with maximum data rates of 266MB/s (1x), 533MB/s (2x), 1066MB/s (4x) and 2133MB/s (8x). Compared to the data rate of PCI (133MB/s) it is not hard to understand why AGP is a considerable improvement. In addition to the official variations of AGP, several unofficial variations exist, such as a version that is based on a 64-bit channel instead of a 32-bit channel. It is used in high-performance graphics cards.

AGP 1x
AGP 1x refers to the initial variation of the Accelerated Graphics Port (AGP) interface. It was specified by Intel in 1997 (specification v1.0) to replace PCI in use with graphics cards. It operates on a 32-bit channel at 66 MHz, providing a maximum transfer rate of 266MB/s, doubling PCI’s rate of 133MB/s.

AGP 2x
AGP 2x refers to the initial variation of the Accelerated Graphics Port (AGP) interface. It was specified by Intel in 1997 (specification v1.0) to replace PCI in use with graphics cards. It operates on a 32-bit channel at 66 MHz, which is double pumped to 133 MHz, which provides a maximum transfer rate of 533MB/s, compared to AGP 1x maximum rate of 266MB/s.

AGP 4x
AGP 4x refers to the initial variation of the Accelerated Graphics Port (AGP) interface. It was specified by Intel (specification v2.0) to improve the performance over AGX 1x and AGP 2x. It operates on a 32-bit channel at 66 MHz, which is quad pumped to 266 MHz, which provides a maximum transfer rate of 1066MB/s, compared to AGP 1x maximum rate of 266MB/s and AGP 2x rate of 533MB/s.

AGP 8x
AGP 8x refers to the initial variation of the Accelerated Graphics Port (AGP) interface. It was specified by Intel (specification v3.0) to improve the performance over AGX 4x. It operates on a 32-bit channel at 66 MHz, strobing 8 times per clock to 533 MHz, which provides a maximum transfer rate of 2133MB/s, compared to AGP 1x maximum rate of 266MB/s, AGP 2x rate of 533MB/s and AGP 4x rate of 1066MB/s.



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