Gigabyte GV-R477D5-512H-B Radeon HD 4770 Review :: Features

05-04-2009 · Category: Hardware - Video Cards

By Doc Overclock

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

  • 640 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 128 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 and Fast Z Clear
  • Lossless Z & stencil compression (up to 128:1)
  • Lossless color compression (up to 8:1)
  • Up to 8 render targets (MRTs) with anti-aliasing
  • Accelerated physics processing

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
  • Gamma correct
  • Super AA (ATI CrossFireX™ configurations only7)
  • 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
  • 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 3.0 support

ATI Avivo™ HD Video and Display Platform

  • Unified Video Decoder 2 (UVD 2) for H.264/AVC, VC-1, and MPEG-2 video formats
    • High definition (HD) playback of Blu-ray and HD DVD video
    • Dual stream (HD+SD) playback support
    • DirectX Video Acceleration 1.0 & 2.0 support
    • Support for BD-Live certified applications
  • Hardware DivX and MPEG-1 video decode acceleration
  • Accelerated video transcoding & encoding for H.264 and MPEG-2 formats
    • 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
    • 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)9
    • Automatic dynamic contrast adjustment

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)3
  • Each includes a dual-link HDCP encoder with on-chip key storage for high resolution playback of protected content4

Two integrated 400 MHz 30-bit RAMDACs

  • Each supports analog displays connected by VGA at all resolutions up to 2048x1536

DisplayPort output support

  • 24- and 30-bit displays at all resolutions up to 2560x1600

HDMI output support

  • All display resolutions up to 1920x1080
  • Integrated HD audio controller with support for stereo and multi-channel (up to 7.1) audio formats, including AC-3, AAC, DTS5, enabling a plug-and-play audio solution over HDMI

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™ Technology

  • 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™ Multi-GPU Technology

  • Scale up rendering performance and image quality with two, three, or four GPUs
  • Integrated compositing engine
  • High performance dual channel bridge interconnect8
  • 40 nanometer process
  • 750MHz core clock
  • 750MHz Shader clock
  • 3200MHz effective memory speed
  • 128-bit memory interface

Brand Name Gigabyte
Part Number GV-R77D5-512H-B
Graphics Chip RV740
Core clock 750
Shader Clock 750
SPs 640
Fabrication Process 40nm
Transistors 826 Million
Memory clock 3200
Memory bus 128-bit
Memory bandwidth 51.2GB/second
Memory Size 512MB
ROPs 16
Texture Filtering Units 64
Texture Filtering Rate 36GT/second
HDCP Support Yes
HDMI Support Yes (via adapter)
Connectors Dual DVI-I, AV-Out
Bus PCI Express 2.0
Form Factor Dual Slot
Power Connectors 6-pin power

The HD 4770 is based upon ATI's RV740 chip, the mainstream equivalent to the RV770 found on the Radeon HD 4890. The chip has 826 million transistors compared to the 956 million found on the HD 4890 and it is ATI's first chip to be based upon TSMC's 40 nanometer manufacturing process. ATI says that the RV740 should consume a maximum of 80W of power, compared to the 110W of power taken up by the HD 4830 which has the same number of SPs but is a cut down HD 4850.

The HD4770 has 640 SPs which is the same as the HD 4830 but it is a new chip instead of a chip that deactivates the SPs like the HD 4830. The card has a 128-bit memory interface but uses GDDR5 memory instead of GDDR3 memory effectively doubling the bandwidth for the same clock speed. Memory speed is rated at 800MHz which means 3200MHz effective memory speed. Bandwidth on the card is 51.2GB/second. The clock speed on the card is 750MHz which is much higher than the HD 4830 due to the HD 4770 being manufactured on a 40nm process.

DirectX 10.1 is the latest release from Microsoft. Games supporting the API have begun appearing on the market including HAWX, Far Cry 2, and BattleForge. Every video card that supports DirectX 11 that is the next graphics API will also have to support DirectX 10.1. DirectX 10.1 mainly improves the visual features like Anti-Aliasing and supports parallel cube mapping. It introduces 32-bit floating point operations as the standard and Shader Model 4.1. ATI is currently the only video card manufacturer to support DirectX 10.1 in large numbers (S3 video cards make up a tiny percentage of the cards on the market).