Radeon R420
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High Quality Content by WIKIPEDIA articles! The Radeon R420 core from ATI Technologies was the company's basis for its 3rd-generation DirectX 9.0/OpenGL 2.0-capable graphics cards. Used first on the Radeon X800, R420 was produced on a 0.13 micrometer (130 nm) low-K process and used GDDR-3 memory. The chip was designed for AGP. Driver support of this core was discontinued as of Catalyst 9.4, and as a result there is no official windows 7 support for any of the X700 - X850 products. In terms of supported DirectX features, R420 (codenamed Loki) was very similar to the R300-based GPUs. R420 basica...
High Quality Content by WIKIPEDIA articles! The Radeon R420 core from ATI Technologies was the company's basis for its 3rd-generation DirectX 9.0/OpenGL 2.0-capable graphics cards. Used first on the Radeon X800, R420 was produced on a 0.13 micrometer (130 nm) low-K process and used GDDR-3 memory. The chip was designed for AGP. Driver support of this core was discontinued as of Catalyst 9.4, and as a result there is no official windows 7 support for any of the X700 - X850 products. In terms of supported DirectX features, R420 (codenamed Loki) was very similar to the R300-based GPUs. R420 basically takes a "wider is better" approach to the previous architecture, with some small tweaks thrown in to enhance it in various ways. The chip came equipped with over double the pixel and vertex pushing resources compared to Radeon 9800 XT, with 16 DirectX 9.0b pixel pipelines and 16 ROPs. One would not be far off seeing the X800 XT basically as a pair of Radeon 9800 cores connected together and also running with a ~30% higher clock speed.
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