Right then, the GeForce 7800 GT, pretty much similar to the it's bigger brother the GTX targeted at the high-end gamer, yet more price competitive. In many ways the card is even comparable to the 6800 series. And although the architecture of the G70 chip looks like it is a refreshed version from the 6800 architecture that is only partly true, NVIDIA made some stern changes inside where all that magic happens. According to NVIDIA the internal pipelines were from top to bottom redesigned to make sure there was lower and thus better latency. Also something new we discovered a little while ago is that the core of the GPU has multiple clocked domains, that goes for this product also as the vertex units are clocked a little higher then the rest of the chip.
I already stated that from a feature point of view nothing has shifted incredibly except performance. But hey, games are moving out of the cave and into the forest, we need some serious performance to display these nifty rendered and incredibly complex scenes. Looking at it from another point of view, there has not been a cut in that feature set. We still see the Shader Model 3 and not 3.0a (which doesn't exist).
Next to that we see small improvements that of course have been made to what we can consider standard NVIDIA technology these days, in the form of CineFX 4.0 engine and Intellisample 4.0 Technology. Let's quickly browse through the most dreary page of this article, GeForce 7800 GPU's impressive specifications.
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
• Transparent multisampling and transparent 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 externa l TMDS transmitters and external TV
encoders
• Full NVIDIA® nView® multi-display technology capability
- 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 |
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