AMD Radeon HD 6990

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With two full-fat Caymen XT GPUs, the total number of stream processors inside this 12in-long card is a staggering 3,072. However, these run at 830MHz rather than the 880MHz of a single-GPU HD 6970 2GB. This has resulted in a horrifically high maximum power draw for the card of 375W – you’ll need a hefty PSU to handle this power-hungry card and still be able to run the rest of your PC.
     As the GPUs are just the same as the Caymen XT GPUs used in the HD 6970 2GB, each has a 256-bit memory interface and the same 32 ROPs, two tessellation units and two rasterisers. As the memory of the HD 6990 4GB runs slightly slower than that of the HD 6970 2GB, however, the memory bandwidth for each GPU is slightly less at 160GB/sec rather than 176GB/sec.

  • Default (BIOS1)
    • Up to 830MHz Engine Clock
    • 5.10 TFLOPs Single Precision compute power
    • 1.27 TFLOPs Double Precision Compute Power
  • Overclocked (BIOS2)
    • Up to 880MHz Engine Clock
    • 5.40 TFLOPs Single Precision compute power o 1.37 TFLOPs Double Precision Compute Power
  • 4GB GDDR5 Memory
  • 1250MHz Memory Clock (5.0 Gbps GDDR5)
  • 320 GB/s memory bandwidth (maximum)
  • TeraScale 3 Unified Processing Architecture
    • 3072 Stream Processors
    • 192 Texture Units
    • 128 Z/Stencil ROP Units
    • 64 Color ROP Units
    • Dual geometry and dual rendering engines
  • High Speed 256-bit GDDR5 memory interface
  • PCI Express 2.1 x16 bus interface
  • “Eye-Definition” graphics
    • Second generation DirectX® 11 graphics
      • Full DirectX® 11 support
      • Scalable geometry processing technology
      • Shader Model 5.0
      • DirectCompute 11 support
      • Quad advanced programmable hardware tessellation units
      • Accelerated multi-threading
      • HDR texture compression
      • Order-independent transparency
    • OpenGL 4.1 support
    • Image quality enhancement technology
      • Up to 24x multi-sample and super-sample anti-aliasing modes
      • Adaptive anti-aliasing
      • Enhanced Quality Anti-Aliasing (EQAA)
      • Morphological Anti-Aliasing (MLAA)
      • 16x angle independent anisotropic texture filtering
      • 128-bit floating point HDR rendering
  • AMD Eyefinity multi-display technology1
    • Native support for up to 5 simultaneous displays
      • Up to 6 displays supported with DisplayPort 1.2 Multi-Stream Transport
    • Independent resolutions, refresh rates, color controls, and video overlays
    • Display grouping
      • Combine multiple displays to behave like a single large display
  • AMD App Acceleration2
    • OpenCL 1.1 Support
    • DirectCompute 11
    • Double Precision Floating Point
    • Accelerated video encoding, transcoding, and upscaling
    • UVD 3 dedicated video playback accelerator
      • MPEG-4 AVC/H.264
      • VC-1
      • MPEG-2 (SD & HD)
      • Multi-View Codec (MVC)
      • MPEG-4 part 2 (DivX, Xvid)
      • Adobe Flash
    • Enhanced Video Quality features
      • Advanced post-processing and scaling
      • Dynamic contrast enhancement and color correction
      • Brighter whites processing (Blue Stretch)
      • Independent video gamma control
      • Dynamic video range control
    • Dual-stream HD (1080p) playback support
    • DXVA 1.0 & 2.0 support
  • AMD HD3D technology4
    • Stereoscopic 3D display/glasses support
    • Blu-ray 3D support
    • Stereoscopic 3D gaming
    • 3rd party Stereoscopic 3D middleware software support
  • AMD CrossFireX™ multi-GPU technology5
    • Dual card performance scaling
  • Cutting-edge display support
    • DisplayPort 1.2
      • Max resolution: 2560x1600 per display
      • Multi-Stream Transport
      • 21.6 Gbps bandwidth
      • High bit-rate audio
    • HDMI 1.4a with Stereoscopic 3D Frame Packing Format, Deep Color, xvYCC wide gamut support, and high bit-rate audio
      • Max resolution: 1920x1200
    • Dual-link DVI with HDCP
      • Max resolution: 2560x1600
  • Integrated HD audio controller
    • Output protected high bit rate 7.1 channel surround sound over HDMI with no additional cables required
    • Supports AC-3, AAC, Dolby TrueHD and DTS Master Audio formats
  • AMD PowerPlay™ power management technology3
    • AMD PowerTune technology7
      • Intelligent power management hardware
    • Dynamic power management with low power idle state
    • Ultra-low power state support for multi-GPU configurations
  • AMD Catalyst™ graphics and HD video configuration software
    • Software support for Windows 7, Windows Vista, and Windows XP
    • AMD Catalyst™ Control Center - AMD Catalyst™ software application and user interface for setup, configuration, and accessing features of AMD Radeon products.
    • Unified Graphics display driver - AMD Catalyst™ software enabling other PC programs and devices to use advanced graphics, video, and features of AMD Radeon™ products.  

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