ATI HD3870 X2 Review

Specifications:

Features:

• 666 million transistors on 55nm fabrication process
• PCI Express 2.0 x16 GPU bus interface1
• 256-bit GDDR3/GDDR4 memory interface
• Ring Bus Memory Controller
• Fully distributed design with 512-bit internal ring bus for memory reads and writes
• Microsoft Direct X 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
• Garter texture fetching
• Unified Superscalar Shader architecture
• 320 stream processor 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 8192x8192)
• Fully associative texture Z/stencil cache designs
• Double-sided Hierarchical Z/stencil buffer
• Early Z test, RE-z, Z Range optimization, and Fast Z
• Lossless Z and 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 o Temporal anti-aliasing
• Gamma correct
• Super AA (ATI Crossfire 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 o Bicubic filtering
• sRGB filtering (gamma/digamma) o Percentage Closer Filtering (PCF)
• Depth and stencil texture (DST) format support
• Shared exponent HDR (RGBE (9:9:9:5) texture format support