ATI Mobility Radeon™ HD 3800 Specs 

ATI Mobility Radeon™ HD 3800 Product Features

• 666 million transistors on 55nm fabrication process
• Unified Superscalar shader architecture
• Microsoft® DirectX® 10.1
• OpenGL 3.2
• Native PCI Express 2.0 x16 bus interface
• 256-bit GDDR3 memory interface
• ATI Avivo™⁶ HD Video and Display architecture
• ATI PowerPlay™⁷ 7.0 power management technology

Ring Bus Memory Controller

• Fully distributed design with 512-bit internal ring bus for memory reads and writes

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

• 320 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 80 texture fetches per clock cycle
• Up to 128 textures per pixel
• Fully associative vertex/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, Re-Z, Z Range optimization, 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

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) for improved quality
• Adaptive super-sampling and multi-sampling
• Temporal anti-aliasing
• 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
• Bicubic 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

ATI Avivo™⁶ HD Video and Display Platform

• Dedicated unified video decoder (UVD) for H.264/AVC and VC-1 video formats
  • High definition (HD) playback of both Blu-ray and HD DVD formats⁵
• Hardware MPEG-1, MPEG-2, and DivX video decode acceleration
  • Motion compensation and iDCT
• ATI Avivo Video Post Processor
  • 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
  • Inverse telecine (2:2 and 3:2 pull-down correction)
  • Bad edit correction
• 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)²
  • Each includes a dual-link HDCP encoder with on-chip key storage for high resolution playback of protected content³
• Two integrated 400 MHz 30-bit RAMDACs
  • Each supports analog displays connected by VGA at all resolutions up to 2048x1536²
• DisplayPort output support⁴
  • Supports 24- and 30-bit displays at all resolutions up to 2560x1600²
• HDMI output support
  • Supports display resolutions up to 1920x1080²
  • Integrated HD audio controller with multi-channel (5.1) AC3 support, enabling a plug-and-play cable-less audio solution
• Integrated AMD Xilleon™ HDTV encoder
  • Provides high quality analog TV output (component/S-video/composite)
  • Supports SDTV and HDTV resolutions
  • Underscan and overscan compensation
• MPEG-2, MPEG-4, DivX, WMV9, VC-1, and H.264/AVC encoding and transcoding
• Seamless integration of pixel shaders with video in real time
• VGA mode support on all display outputs

ATI PowerPlay™⁷

• 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™⁸ Multi-GPU Technology

• Scale up rendering performance and image quality with two, three, or four GPUs
• Integrated compositing engine
• High performance dual channel bridge interconnect¹