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Product : GeForce 7800 GT
Company : nVIDIA
Author : Mark 'Ratchet' Thorne
Date : August 25th, 2005

Specifications and Features

The 7800 GT is built on NVIDIA's G70 core, the same one the 7800 GTX is built on. It's manufactured at TSMC using their 110nm manufacturing process and weighs in at a whopping 302 million transistors, making it the largest graphics chip ever manufactured.

The card itself has been given some tweaks so that the 7800 GT is about a half-inch shorter than the 7800 GTX, but the GT features the same features as capabilities as it's big brother. The changes include slower core and memory speeds, which were tweaked from 430MHz/1.2GHz on the GTX to 400MHz/1.0GHz on the GT, and a different cooler which lacks the heatpipe technology found on the GTX. The most significant difference however is that where the GTX has 6 quads enabled, giving it 24 pixel pipelines and 8 vertex units, the GT has only 5 quads enabled which reduces it to 20 pixel-pipelines and 7 vertex units.


Specifications
  GeForce 7800 GT GeForce 7800 GTX Radeon X850XT-PE
Core G70 G70 R480
Silicon Process 110nm 110nm 130nm low-k
Transistor Count
(millions)
302 302 160
Core Speed MHz 400 430 540
Memory Speed MHz 500 GDDR3
(1.0GHz)
600 GDDR3
(1.2GHz)
590 GDDR3
(1.18GHz)
Bus Standard PEG x16 PEG x16 PEG x16
Bus Width 256bit 256bit 256bit
Pipeline Configuration
Textures/Pixels/Z Samples (Per Clock)
20/16/32 24/16/32 16/16/16
Vertex Units 7 8 6
Peak Memory Bandwidth
(GB/s)
32.0 38.4 37.8
Pixel Fillrate
(million pixels/sec)
6,400 6,880 8,640
Texel Fillrate
(million texels/sec)
8,000 10,320 8,640
API Compliancy DX 9.0c
Shader Model 3.0
DX 9.0c
Shader Model 3.0
DX 9.0b
Shader Model 2.0
MSRP ($US) $449 $599 $549

NVIDIA® CineFX™ 4.0 Shading Architecture

  • Vertex Shaders
    • Support for Microsoft DirectX 9.0 Vertex Shader 3.0
    • Displacement mapping
    • Geometry instancing
    • Infinite length vertex programs
  • Pixel Shaders
    • Support for DirectX 9.0 Pixel Shader 3.0
    • Full pixel branching support
    • Support for Multiple Render Targets (MRTs)
    • Infinite length pixel programs
  • Next-Generation Texture Engine
    • Accelerated texture access
    • Up to 16 textures per rendering pass
    • Support for 16-bit floating point format and 32-bit floating point format
    • Support for non-power of two textures
    • Support for sRGB texture format for gamma textures
    • DirectX and S3TC texture compression
  • Full 128-bit studio-quality floating point precision through the entire rendering pipeline with native hardware support for 32bpp, 64bpp, and 128bpp rendering modes

64-Bit Texture Filtering and Blending

  • Full floating point support throughout entire pipeline
  • Floating point filtering improves the quality of images in motion
  • Floating point texturing drives new levels of clarity and image detail
  • Floating point frame buffer blending gives detail to special effects like motion blur and explosions

NVIDIA® Intellisample™ 4.0 Technology

  • Advanced 16x anisotropic filtering (with up to 128 Taps)
  • Blistering-fast antialiasing and compression performance
  • Gamma-adjusted rotated-grid antialiasing removes jagged edges for incredible image quality
  • Transparency multisampling and transparency supersampling modes boost antialiasing quality to new levels
  • Support for normal map compression
  • Support for advanced lossless compression algorithms for color, texture, and z-data at even higher resolutions and frame rates
  • Fast z-clear

NVIDIA® UltraShadow™ II Technology

  • Designed to enhance the performance of shadow-intensive games

NVIDIA® SLI™ Technology

  • Patented hardware and software technology allows two GPUs to run in parallel to scale performance
  • Scales performance on over 60 top PC games and applications

NVIDIA® PureVideo™ Technology

  • Adaptable programmable video processor
  • High-definition MPEG-2 and WMV9 hardware acceleration
  • Spatial-temporal de-interlacing
  • Inverse 2:2 and 3:2 pull-down (Inverse Telecine)
  • 4-tap horizontal, 5-tap vertical scaling
  • Overlay color temperature correction
  • Microsoft® Video Mixing Renderer (VMR) supports multiple video windows with full video quality and features in each window
  • Integrated HDTV output

Composited Desktop Hardware Engine

  • Video post-processing
  • Real Time desktop compositing
  • Accelerated antialiased text rendering
  • Pixel shader driven special effects and animation

Advanced Display Functionality

  • Dual integrated 400MHz RAMDACs for display resolutions up to and including 2048x1536 at 85Hz
  • Dual DVO ports for interfacing to external TMDS transmitters and external TV encoders
  • Full NVIDIA® nView® multi-display technology capability

Advanced Engineering

  • Designed for PCI Express x16
  • Designed for high-speed GDDR3 memory

NVIDIA® Digital Vibrance Control™ (DVC) 3.0 Technology

  • DVC color controls
  • DVC image sharpening controls

Operating Systems

  • Windows XP/Windows XP 64
  • Windows ME
  • Windows 2000
  • Linux
  • Macintosh OS X

API Support

  • Complete DirectX support, including the latest version of Microsoft DirectX 9.0 Shader Model 3.0
  • Full OpenGL support, including OpenGL 2.0




G70 Core
G70 Core

7800 GT Layout
7800 GT Layout

7800 GTX with 7800 GT
7800 GTX with 7800 GT

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