AMD Radeon HD 4890 (RV790) - Review, Infos, Bilder, Benchmarks

Die Shaderarchitektur ist bei der Radeon HD 4890 unberührt geblieben. Es kommen weiterhin 800 Streamprozessoren (5 x 160) zum Einsatz, welche die Direct3D 10.1 Sprache sprechen. Durch den Chiptakt erhöht sich die theoretische Shaderleistung von 1200 auf 1360 GFLops pro Sekunde. Hier hat die Geforce GTX 275 deutliche Nachteile, denn die 240 Streamprozessoren erreichen lediglich eine Leistung von 1011 GFLOP/s, was sich in shaderlastigen 3D-Spielen bemerkbar machen wird.

Theoretische Shaderleistung
Radeon HD 4890: 1.360 GFLops/
Radeon HD 4870: 1.200 GFLops/
Geforce GTX 275: 1.011  GFLops/

Leistung hin oder her! Heutzutage wird es immer wichtiger, die Leistungsaufnahme aktueller Grafikkarten im Auge zu behalten. Und hier sind die High-End-Modelle a la Geforce GTX oder Radeon HD 4xxx alles andere als rühmlich. Die Radeon HD 4890 verursacht unter Volllast eine Energieaufnahme von bis zu 190 Watt. Die Geforce GTX 275 überbietet diesen Watt noch mals um weitere 31 Watt. Hier beträgt die maximale Leistungsaufnahme ("Stromverbrauch") 221 Watt. Nich zu vergessen ist die Tatsache, dass eine solche energiehungrige Grafikkarte auch ausreichend gekühlt werden muss, was nur mittels aufwendiger und oftmals auch lauter Kühlung umgesetzt werden kann. Wer also einen leisen und stromsparenden PC betreiben möchte, der sollte einen Bogen um die High-End-Modelle machen.

Technische Übersicht Radeon HD 4980

Benchmarks zur Radeon HD 4890

Technische Daten von der Herstellerseite

• 956 million transistors on 55nm fabrication process
• PCI Express 2.0 x16 bus interface
• 256-bit GDDR5 memory interface
• Microsoft® DirectX® 10.1 support
  • Shader Model 4.1
  • 32-bit floating point texture filtering
  • Indexed cube map arrays
  • Independent blend modes per render target
  • Pixel coverage sample masking
  • Read/write multi-sample surfaces with shaders
  • Gather4 texture fetching

• Unified Superscalar Shader Architecture

  • 800 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 160 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)
  • Up to 8 render targets (MRTs) with anti-aliasing
  • Accelerated physics processing

• Dynamic Geometry Acceleration
  • High performance vertex cache
  • Programmable tessellation unit
  • Accelerated geometry shader path for geometry amplification
  • Memory read/write cache for improved stream output performance

• Anti-aliasing features
  • Multi-sample anti-aliasing (2, 4, or 8 samples per pixel)
  • Up to 24x Custom Filter Anti-Aliasing (CFAA)
  • 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

• OpenGL 3.0 support
• ATI Avivo™ HD Video and Display Platform¹

  • Unified Video Decoder (UVD) for H.264/AVC, VC-1, and MPEG-2 video formats
    • High definition (HD) playback of Blu-ray and HD DVD video²
    • Dual stream (HD+SD) playback support
    • DirectX Video Acceleration 1.0 & 2.0 support
    • Support for BD-Live certified applications

  • Hardware DivX and MPEG-1 video decode acceleration
  • ATI Avivo Video Post Processor¹
    • Color space conversion
    • Chroma subsampling format conversion
    • Horizontal and vertical scaling
    • Gamma correction
    • Advanced vector adaptive per-pixel de-interlacing
    • De-blocking and noise reduction filtering
    • Detail enhancement
    • Color vibrance and flesh tone correction
    • Inverse telecine (2:2 and 3:2 pull-down correction)
    • Bad edit correction
    • Enhanced DVD upscaling (SD to HD)⁹
    • Automatic dynamic contrast adjustment

  • Two independent display controllers
    • Drive two displays simultaneously with independent resolutions, refresh rates, color controls and video overlays for each display
    • Full 30-bit display processing
    • Programmable piecewise linear gamma correction, color correction, and color space conversion
    • Spatial/temporal dithering provides 30-bit color quality on 24-bit and 18-bit displays
    • High quality pre- and post-scaling engines, with underscan support for all display outputs
    • Content-adaptive de-flicker filtering for interlaced displays
    • Fast, glitch-free mode switching
    • Hardware cursor

  • Two integrated dual-link DVI display outputs
    • Each supports 18-, 24-, and 30-bit digital displays at all resolutions up to 1920x1200 (single-link DVI) or 2560x1600 (dual-link DVI)³
    • Each includes a dual-link HDCP encoder with on-chip key storage for high resolution playback of protected content⁴

  • Two integrated 400 MHz 30-bit RAMDACs
    • Each supports analog displays connected by VGA at all resolutions up to 2048x1536³

  • DisplayPort output support
    • 24- and 30-bit displays at all resolutions up to 2560x1600³

  • HDMI output support
    • All display resolutions up to 1920x1080³
    • Integrated HD audio controller with support for stereo and multi-channel (up to 7.1) audio formats, including AC-3, AAC, DTS⁵, enabling a plug-and-play audio solution over HDMI

  • Integrated AMD Xilleon™ HDTV encoder
    • Provides high quality analog TV output (component/S-video/composite)
    • Supports SDTV and HDTV resolutions
    • Underscan and overscan compensation

  • Seamless integration of pixel shaders with video in real time
  • VGA mode support on all display outputs

• ATI PowerPlay™ Technology⁶

  • Advanced power management technology for optimal performance and power savings
  • Performance-on-Demand
    • Constantly monitors GPU activity, dynamically adjusting clocks and voltage based on user scenario
    • Clock and memory speed throttling
    • Voltage switching
    • Dynamic clock gating
    • Central thermal management – on-chip sensor monitors GPU temperature and triggers thermal actions as required

• ATI CrossFireX™ Multi-GPU Technology⁷
  • Scale up rendering performance and image quality with up to four GPUs
  • Integrated compositing engine
  • High performance dual channel bridge interconnect⁸

Quelle: http://ati.amd.com/products/radeonhd4800/specs-4890.html

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