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Sapphire Radeon HD 4870 X2 Atomic ST-6026 E-mail
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Written by Olin Coles   
Thursday, 18 December 2008
Table of Contents: Page Index
Sapphire Radeon HD 4870 X2 Atomic ST-6026
Radeon HD 4870 X2 Features
Atomic ST-6026 Specifications
First Look: Sapphire Atomic
Video Card Testing Methodology
3DMark06 Test Results
COD 4 Fraps Benchmarks
Crysis Benchmark Results
Devil May Cry 4 Benchmark
World in Conflict Benchmarks
VGA Power Consumption
Atomic 4870 X2 Heat Output
Radeon 4800-Series Final Thoughts
Sapphire ST-6026 Conclusion

Atomic ST-6026 Specifications

Bringing the highest levels of graphics and gaming performance ever seen in the PC, SAPPHIRE Technology - the leading innovator of ATI-based graphics solutions - is now introducing the amazing single slot, liquid cooled ATOMIC Edition of its HD 4870 X2.

  • 1.912 billion transistors total (956 million transistors per GPU on 55nm fabrication process)
  • Display Output: Dual DL-DVI-I+HDTV
  • RV770 Core Clock: 800 MHz (x2)
  • Memory Clock: 1000MHz, 4000 MHz DDR Data Rate.
  • PCI Express 2.0 x16 bus interface
  • 2048MB /256bit GDDR5 memory interface
  • Single-Slot Active Water-Cooler
  • HDMI compliant via dongle
  • 7.1 Audio Channel Support
  • Microsoft DirectX 10.1 support
  • Shader Model 4.1 support
  • Product SKU: ST-6026

  • Series

    ATI Radeon HD 4870 ATI Radeon HD 4850

    ATI Radeon HD 4850 X2

    ATI Radeon HD 4870 X2 Sapphire Atomic 4870 X2
    Stream Processors 800 800


    800x2 800x2
    Texture Units 40 40


    40x2 40x2
    ROPs 16 16


    16x2 16x2
    Core Clock 750MHz 625MHz


    750MHz 800MHz
    Memory Clock 900MHz (3600MHz data rate) GDDR5 993MHz (1986MHz data rate) GDDR3

    993MHz (1986MHz data rate) GDDR3

    900MHz (3600MHz data rate) GDDR5 1000MHz (4000MHz 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


    2x956M 2x956M
    Manufacturing Process TSMC 55nm TSMC 55nm

    TSMC 55nm

    TSMC 55nm TSMC 55nm

    Unified Superscalar Shader Architecture

    • 1600 stream processing units Sapphire_Atomic_4870-X2_GPU-Z.png
      • 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 CrossFireX 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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