ATI Radeon™ HD 3870 Mac & PC Edition - Specifications
- 666 million transistors on 55nm fabrication process
- PCI Express 2.0 x16 bus interface
- 256-bit GDDR3/GDDR4 memory interface
- Ring Bus Memory Controller
- Fully distributed design with 512-bit internal ring bus for memory reads and writes
- 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 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, 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)
- Adaptive super-sampling and multi-sampling
- Temporal anti-aliasing
- Gamma correct
- 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
- OpenGL 2.0 support
- 32-bit floating point texture filtering
- 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)1,2
- Two integrated 400 MHz 30-bit RAMDACs
- Each supports analog displays connected
by VGA at all resolutions up to 2048x1536
- HDMI output support
- Supports all display resolutions up to
1920x1080
- 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™
- 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
- Visit http://ati.amd.com/products/radeonhd3800/specs.html to view the
PC specifications
1 While the ATI Radeon™ HD 3870 Mac & PC edition
does support 30-bit digital display under the Mac OS, display output
is limited to 24-bit
and below.
2 Some resolutions are limited by the performance of the attached monitor
and some custom resolutions require user configuration.
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