All models use an AGP 8x interface 1 Pixel shaders : Vertex Shaders : Texture mapping units : Render output units 2 The 256-bit version of the 9800 SE when unlocked to 8-pixel pipelines with third party driver modifications should function close to a full 9800 Pro. PCI-E (X3xx, X5xx, X6xx, X1000 series) All models include Direct3D 9.0 and OpenGL 2.0 All models use a PCI-E ×16 interface 1 Pixel shaders : Vertex Shaders : Texture mapping units : Render output units IGP (X2xx, 11xx series) All models include Direct3D 9.0 and OpenGL 2.0 Based on the Radeon X300 1Pixel shaders : Vertex Shaders : Texture mapping units : Render output units Radeon X700 and X800 series AGP (X7xx, X8xx) All models include AGP 8× All models include Direct3D 9.0b and OpenGL 2.0 1 Pixel shaders : Vertex shaders : Texture mapping units : Render output units PCI-E (X5xx, X7xx, X8xx, X1000 series) All models include PCI-E ×16 All models include Direct3D 9.0b and OpenGL 2.0 1 Pixel shaders : Vertex Shaders : Texture mapping units : Render output units IGP (X12xx, 21xx) All models include Direct3D 9.0b and OpenGL 2.0 Based on Radeon X700 Radeon X1000 series Note that ATI X1000 series cards (e.g. X1900) do not have Vertex Texture Fetch, hence they do not fully comply with the VS 3.0 model. Instead, they offer a feature called "Render to Vertex Buffer (R2VB)" that provides functionality that is an alternative Vertex Texture Fetch. 1 Pixel shaders : Vertex shaders : Texture mapping units : Render output units Radeon HD 2000 series Radeon HD 3000 series IGP (HD 3000) All Radeon HD 3000 IGP models include Direct3D 10.0 and OpenGL 3.3 1 Unified shaders : Texture mapping units : Render output units 2 The clock frequencies may vary in different usage scenarios, as AMD PowerPlay technology is implemented. The clock frequencies listed here refer to the officially announced clock specifications. 3 The sideport is a dedicated memory bus. It is preferably used for a frame buffer. All-in-Wonder series 1 Pixel shaders : Vertex shaders : Texture mapping units : Render output units 2 Unified shaders : Texture mapping units : Render output units Radeon HD 4000 series 1 Unified shaders : Texture mapping units : Render output units 2 The effective data transfer rate of GDDR5 is quadruple its nominal clock, instead of double as it is with other DDR