NVIDIA GeForce 7800 GT: XFX Style

Introduction & Specifications

It's been only about seven weeks since the GeForce 7800 GTX was officially launched on June 22, but NVIDIA is already making news yet again today with the latest addition to their GeForce 7 Series of cards, the new GeForce 7800 GT. As its name implies, the GeForce 7800 GT is very similar to NVIDIA's current flagship GeForce 7800 GTX, but the GT is launching with a significantly lower MSRP for a couple of reasons. Both cards are based on the GPU formerly codenamed "G70", however, the GeForce 7800 GT has four less pixel pipelines and is missing one vertex unit when compared to the GTX version. The new GeForce 7800 GT's reference specifications also call for lower core and memory clock speeds than the GeForce 7800 GTX, but we don't think NVIDIA's reference specifications are going to be followed by their board partners.  The XFX card that we tested for this article surely didn't.

GeForce 7800 GT Specifications
The GTX's Little Brother

Click Any Image For An Enlarged View

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

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

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 Digital Vibrance Control (DVC) 3.0 Technology
_DVC color controls
_DVC image sharpening controls

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

Operating Systems
_Windows XP/XP 64/ME/2000
_Macintosh OS X

The GeForce 7800 GT GPU:
Front View

The GeForce 7800 GT GPU:
Underside View

An entire wafer of G70s...


Due to the fact that the new NVIDIA GeForce 7800 GT GPU is based upon the same core architecture as the GeForce 7800 GTX, it shares essentially the same feature set as its higher-powered counterpart. We've detailed NVIDIA's latest architecture in-depth in our original coverage of the GeForce 7800 GTX launch back in June, so we'd recommend perusing that article if you're not familiar with what the GPU formerly code named G70 brings to the table. On top of everything offered by NVIDIA's previous flagship GeForce 6800 Ultra (NV40), the G70 GPU incorporates new anti-aliasing modes in the Intellisample 4.0 engine that improve the appearance of partially transparent textures, such as those used in many outdoor scenes for foliage. The G70 also has an updated dedicated video processor, dubbed PureVideo, with more features than its predecessor.  And of course, the G70 has enhancements to its pixel and vertex shader pipelines for increased performance, as well.

Tags:  Nvidia, GeForce, XFX, force, fx, GT, 7800, 780, id

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