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GeForce 8800 GTX vs GeForce 8800 Ultra

Intro

The GeForce 8800 GTX makes use of a 90 nm design. nVidia has set the core speed at 575 MHz. The GDDR3 memory works at a frequency of 900 MHz on this specific model. It features 128 SPUs along with 64 TAUs and 24 Rasterization Operator Units.

Compare those specifications to the GeForce 8800 Ultra, which makes use of a 90 nm design. nVidia has set the core frequency at 612 MHz. The GDDR3 memory works at a speed of 1080 MHz on this particular model. It features 128 SPUs as well as 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

Theoretically, the GeForce 8800 Ultra should be a bit faster than the GeForce 8800 GTX in general. (explain)

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

Texel Rate

The GeForce 8800 Ultra is just a 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

The GeForce 8800 Ultra will be a bit (about 6%) better at FSAA than the GeForce 8800 GTX, and should be capable of handling higher resolutions without losing too much performance. (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

Check prices at:

GeForce 8800 Ultra

Amazon.com

Check prices at:

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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. 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 quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce 8800 GTX

Amazon.com

Check prices at:

GeForce 8800 Ultra

Amazon.com

Check prices at:

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.

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