page_title: Radeon X1000 series
section_title: X1900 and X1950 series
hierarchical_section_title: Radeon X1000 series / Variants / X1900 and X1950 series
caption_attribution_description: English: ATI Radeon Sapphire X1950 Pro.
context_page_description: The R520 is a Graphics processing unit developed by ATI Technologies and produced by TSMC. It was the first GPU produced using a 90 nm photolithography process.
  The R520 is the foundation for a line of DirectX 9.0c and OpenGL 2.0 3D accelerator X1000 video cards. It is ATI's first major architectural overhaul since the R300 and is highly optimized for Shader Model 3.0. The Radeon X1000 series using the core was introduced on October 5, 2005, and competed primarily against nVidia's GeForce 7000 series. ATI released the successor to the R500 series with the R600 series on May 14, 2007.
  ATI does not provide official support for any X1000 series cards for Windows 8 or Windows 10; the last AMD Catalyst for this generation are the 10.2 from 2010 up to Windows 7. However, AMD stopped providing drivers for Windows 7 for this series in 2015.
  Using a Linux distribution a series of open source Radeon drivers are available.
  The same GPUs are also found in some AMD FireMV products targeting multi-monitor set-ups.
context_section_description: The X1900 and X1950 series fixes several flaws in the X1800 design and adds a significant pixel shading performance boost. The R580 core is pin compatible with the R520 PCBs meaning that a redesign of the X1800 PCB was not needed. The boards carry either 256 MiB or 512 MiB of onboard GDDR3 memory depending on the variant. The primary change between R580 and R520 is that ATI changed the pixel shader processor to texture processor ratio. The X1900 cards have 3 pixel shaders on each pipeline instead of 1, giving a total of 48 pixel shader units. ATI has taken this step with the expectation that future 3D software will be more pixel shader intensive.
  In the latter half of 2006, ATI introduced the Radeon X1950 XTX. This is a graphics board using a revised R580 GPU called R580+. R580+ is the same as R580 except for support of GDDR4 memory, a new graphics DRAM technology that offers lower power consumption per clock and offers a significantly higher clock rate ceiling. X1950 XTX clocks its RAM at 1 GHz (2 GHz DDR), providing 64.0 GB/s of memory bandwidth, a 29% advantage over the X1900 XTX. The card was launched on August 23, 2006.
  The X1950 Pro was released on October 17, 2006 and was intended to replace the X1900GT in the competitive sub-$200 market segment. The X1950 Pro GPU is built from the ground up on the 80 nm RV570 core with only 12 texture units and 36 pixel shaders. The X1950 Pro is the first ATI card that supports native Crossfire implementation by a pair of internal Crossfire connectors, which eliminates the need for the unwieldy external dongle found in older Crossfire systems.
caption: Sapphire Radeon X1950 Pro
exif: {}