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GeForce 8800 GTX vs GeForce 8800 Ultra


Intro

The GeForce 8800 GTX has core speeds of 575 MHz on the GPU, and 900 MHz on the 768 MB of GDDR3 memory. It features 128 SPUs as well as 64 TAUs and 24 ROPs.

Compare all of that to the GeForce 8800 Ultra, which comes with core clock speeds of 612 MHz on the GPU, and 1080 MHz on the 768 MB of GDDR3 memory. It features 128 SPUs as well as 64 Texture Address Units and 24 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTX 155 Watts
GeForce 8800 Ultra 171 Watts
Difference: 16 Watts (10%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 Ultra should be 20% faster than the GeForce 8800 GTX overall, due to its greater bandwidth. (explain)

GeForce 8800 Ultra 103680 MB/sec
GeForce 8800 GTX 86400 MB/sec
Difference: 17280 (20%)

Texel Rate

The GeForce 8800 Ultra will be a little bit (more or less 6%) better at AF than the GeForce 8800 GTX. (explain)

GeForce 8800 Ultra 39168 Mtexels/sec
GeForce 8800 GTX 36800 Mtexels/sec
Difference: 2368 (6%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 8800 Ultra is the winner, but not by far. (explain)

GeForce 8800 Ultra 14688 Mpixels/sec
GeForce 8800 GTX 13800 Mpixels/sec
Difference: 888 (6%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

GeForce 8800 GTX

GeForce 8800 Ultra

Specifications

Display Specifications

Hide Specifications

Model GeForce 8800 GTX GeForce 8800 Ultra
Manufacturer nVidia nVidia
Year Nov 2006 May 2007
Code Name G80 G80
Memory 768 MB 768 MB
Core Speed 575 MHz 612 MHz
Memory Speed 1800 MHz 2160 MHz
Power (Max TDP) 155 watts 171 watts
Bandwidth 86400 MB/sec 103680 MB/sec
Texel Rate 36800 Mtexels/sec 39168 Mtexels/sec
Pixel Rate 13800 Mpixels/sec 14688 Mpixels/sec
Unified Shaders 128 128
Texture Mapping Units 64 64
Render Output Units 24 24
Bus Type GDDR3 GDDR3
Bus Width 384-bit 384-bit
Fab Process 90 nm 90 nm
Transistors 681 million 681 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

GeForce 8800 GTX

GeForce 8800 Ultra

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