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GeForce 8800 GTX vs GeForce 8800 Ultra

Intro

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

Compare all that to the GeForce 8800 Ultra, which has clock speeds of 612 MHz on the GPU, and 1080 MHz on the 768 MB of GDDR3 RAM. It features 128 SPUs along with 64 TAUs and 24 ROPs.

Display Graphs

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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

As far as performance goes, the GeForce 8800 Ultra should in theory be a small bit superior to the GeForce 8800 GTX overall. (explain)

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

Texel Rate

The GeForce 8800 Ultra is a bit (about 6%) more effective 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 using lots of anti-aliasing is important to you, then the GeForce 8800 Ultra is superior to the GeForce 8800 GTX, though only just barely. (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

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GeForce 8800 GTX

Amazon.com

GeForce 8800 Ultra

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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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: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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