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Sapphire Radeon HD 4870 X2 Video Card 100251SR E-mail
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Written by Olin Coles   
Sunday, 17 August 2008
Table of Contents: Page Index
Sapphire Radeon HD 4870 X2 Video Card 100251SR
Radeon HD 4870 X2 Features
Sapphire 100251SR Specifications
Closer Look: Sapphire 4870
Video Card Testing Methodology
3DMark06 Test Results
COD 4 Fraps Benchmarks
Crysis Benchmark Results
Unreal Tournament 3
World in Conflict Benchmarks
Power Consumption and Heat Output
Radeon 4800-Series Final Thoughts
Radeon 4870 X2 Conclusion

Sapphire 100251SR Specifications

The ATI Radeon HD 4870 X2 GPU brings the power of graphics to gamers, setting a new standard for visual computing. Redefine the way you play and take HD gaming to the extreme with best-in-class performance. The new TeraScale graphics engine delivers an immersive, cinematic gaming experience. Add this GPU to your PC and watch Blu-ray movies and play HD content with incredible visual fidelity.* Do it all with break-through efficiency that doesn't compromise performance.

  • 1.912 billion transistors total (956 million transistors per GPU on 55nm fabrication process)
  • Display Output: Dual DL-DVI-I+HDTV
  • RV770 Core Clock: 750 MHz (x2)
  • Memory Clock: 900MHz, 1800 MHz DDR.
  • PCI Express 2.0 x16 bus interface
  • 1024MB /256bit GDDR5 memory interface (x2)
  • Dual-Slot Active Cooler
  • HDMI compliant via dongle
  • 7.1 Audio Channel Support
  • Microsoft DirectX 10.1 support
  • Shader Model 4.1 support
  • Product SKU:100251SR

  • Series

    ATI Radeon HD 4870 ATI Radeon HD 4850

    ATI Radeon HD 4850 X2

    ATI Radeon HD 4870 X2
    Stream Processors 800 800

    800x2

    800x2
    Texture Units 40 40

    40x2

    40x2
    ROPs 16 16

    16x2

    16x2
    Core Clock 750MHz 625MHz

    625MHz

    750MHz
    Memory Clock 900MHz (3600MHz data rate) GDDR5 993MHz (1986MHz data rate) GDDR3

    993MHz (1986MHz data rate) GDDR3

    900MHz (3600MHz data rate) GDDR5
    Memory Bus Width 256-bit 256-bit

    2x256-bit

    2x256-bit
    Frame Buffer 512MB/1GB 512MB

    2x1GB

    2x1GB
    Transistor Count 956M 956M

    2x514M

    2x956M
    Manufacturing Process TSMC 55nm TSMC 55nm

    TSMC 55nm

    TSMC 55nm

    Unified Superscalar Shader Architecture

    • 1600 stream processing units
      • Dynamic load balancing and resource allocation for vertex, geometry, and pixel shaders
      • Common instruction set and texture unit access supported for all types of shaders
      • Dedicated branch execution units and texture address processors
    • 128-bit floating point precision for all operations
    • Command processor for reduced CPU overhead
    • Shader instruction and constant caches
    • Up to 320 texture fetches per clock cycle
    • Up to 128 textures per pixel
    • Fully associative multi-level texture cache design
    • DXTC and 3Dc+ texture compression
    • High resolution texture support (up to 8192 x 8192)
    • Fully associative texture Z/stencil cache designs
    • Double-sided hierarchical Z/stencil buffer
    • Early Z test and Fast Z Clear
    • Lossless Z & stencil compression (up to 128:1)
    • Lossless color compression (up to 8:1)
    • 8 render targets (MRTs) with anti-aliasing support
    • Physics processing support

    Anti-Aliasing Features

    • Multi-sample anti-aliasing (2, 4 or 8 samples per pixel)
    • Up to 24x Custom Filter Anti-Aliasing (CFAA) for superior quality
    • Adaptive super-sampling and multi-sampling
    • Gamma correct
    • Super AA (ATI CrossFireXTM configurations only)
    • All anti-aliasing features compatible with HDR rendering

    Texture Filtering Features

    • 2x/4x/8x/16x high quality adaptive anisotropic filtering modes (up to 128 taps per pixel)
    • 128-bit floating point HDR texture filtering
    • sRGB filtering (gamma/degamma)
    • Percentage Closer Filtering (PCF)
    • Depth & stencil texture (DST) format support
    • Shared exponent HDR (RGBE 9:9:9:5) texture format support



     

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