Relentlessly Pursuing Performance

Tear through the latest games with seamless frame rates and go beyond HD1 with the power of the ATI Radeon™ HD 4890 graphics processing unit (GPU). Building on the strength of the ATI Radeon™ 4800 series award-winning architecture, this GPU stands out from the rest with massive graphics processing muscle. Take ultimate control over your game and crank it up with scalable performance. Go ahead, max out the settings and put the ATI Radeon HD 4890 through its paces

Features & Benefits
- TeraScale Graphics Engine - The TeraScale graphics engine in the ATI Radeon™ HD 4890 features over one teraFLOPS, nearly one billion transistors and 800 stream processors so you can enjoy the high resolutions and fast frame rates previously only available with dual-card systems2.
- Advanced Memory - GDDR5 provides twice the data per pin of GDDR3 memory at the same clock speeds.
- Enhanced Anti-Aliasing & Anisotropic Filtering - High performance anisotropic filtering and 24x custom filter anti-aliasing (CFAA) smooth jagged edges and create true-to-life graphics, for everything from grass to facial features.
- ATI CrossFireX™ Technology - ATI CrossFireX™ technology with up to quad GPU support offers superior scalability so your system is ready to level up when you are3.
- Power to Spare - This GPU has the brute processing power needed for physics, artificial intelligence, stream computing and ray tracing calculations.

Specifications

    * 956 million transistors on 55nm fabrication process
    * PCI Express 2.0 x16 bus interface
    * 256-bit GDDR5 memory interface
    * Microsoft® DirectX® 10.1 support
          o Shader Model 4.1
          o 32-bit floating point texture filtering
          o Indexed cube map arrays
          o Independent blend modes per render target
          o Pixel coverage sample masking
          o Read/write multi-sample surfaces with shaders
          o Gather4 texture fetching
    * Unified Superscalar Shader Architecture
          o 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
          o 128-bit floating point precision for all operations
          o Command processor for reduced CPU overhead
          o Shader instruction and constant caches
          o Up to 160 texture fetches per clock cycle
          o Up to 128 textures per pixel
          o Fully associative multi-level texture cache design
          o DXTC and 3Dc+ texture compression
          o High resolution texture support (up to 8192 x 8192)
          o Fully associative texture Z/stencil cache designs
          o Double-sided hierarchical Z/stencil buffer
          o Early Z test and Fast Z Clear
          o Lossless Z & stencil compression (up to 128:1)
          o Lossless color compression (up to 8:1)
          o Up to 8 render targets (MRTs) with anti-aliasing
          o Accelerated physics processing
    * Dynamic Geometry Acceleration
          o High performance vertex cache
          o Programmable tessellation unit
          o Accelerated geometry shader path for geometry amplification
          o Memory read/write cache for improved stream output performance
    * Anti-aliasing features
          o Multi-sample anti-aliasing (2, 4, or 8 samples per pixel)
          o Up to 24x Custom Filter Anti-Aliasing (CFAA)
          o Adaptive super-sampling and multi-sampling
          o Gamma correct
          o Super AA (ATI CrossFireX™ configurations only)
          o All anti-aliasing features compatible with HDR rendering
    * Texture filtering features
          o 2x/4x/8x/16x high quality adaptive anisotropic filtering modes (up to 128 taps per pixel)
          o 128-bit floating point HDR texture filtering
          o sRGB filtering (gamma/degamma)
          o Percentage Closer Filtering (PCF)
          o Depth & stencil texture (DST) format support
          o Shared exponent HDR (RGBE 9:9:9:5) texture format support
    * OpenGL 3.1 support
    * ATI Avivo™ HD Video and Display Platform1
          o 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
          o Hardware DivX and MPEG-1 video decode acceleration
          o 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)
                + Automatic dynamic contrast adjustment
          o 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
          o 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
          o Two integrated 400 MHz 30-bit RAMDACs
                + Each supports analog displays connected by VGA at all resolutions up to 2048x15363
          o DisplayPort output support
                + 24- and 30-bit displays at all resolutions up to 2560x16003
          o 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, DTS, enabling a plug-and-play audio solution over HDMI
          o Integrated AMD Xilleon™ HDTV encoder
                + Provides high quality analog TV output (component/S-video/composite)
                + Supports SDTV and HDTV resolutions
                + Underscan and overscan compensation
          o Seamless integration of pixel shaders with video in real time
          o VGA mode support on all display outputs
    * ATI PowerPlay™ Technology5
          o Advanced power management technology for optimal performance and power savings
          o 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 Technology6
          o Scale up rendering performance and image quality with up to four GPUs
          o Integrated compositing engine
          o High performance dual channel bridge interconnect7



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