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GeForce 8800 GTX vs GeForce 9800 GX2

Intro

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

Compare that to the GeForce 9800 GX2, which comes with a GPU core clock speed of 600 MHz, and 512 MB of GDDR3 RAM set to run at 1000 MHz through a 256-bit bus. It also features 128 Stream Processors, 64 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTX 155 Watts
GeForce 9800 GX2 197 Watts
Difference: 42 Watts (27%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 should perform a lot faster than the GeForce 8800 GTX overall. (explain)

GeForce 9800 GX2 128000 MB/sec
GeForce 8800 GTX 86400 MB/sec
Difference: 41600 (48%)

Texel Rate

The GeForce 9800 GX2 will be much (approximately 109%) more effective at texture filtering than the GeForce 8800 GTX. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce 8800 GTX 36800 Mtexels/sec
Difference: 40000 (109%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce 9800 GX2 is the winner, and very much so. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
GeForce 8800 GTX 13800 Mpixels/sec
Difference: 5400 (39%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce 8800 GTX

Amazon.com

Check prices at:

GeForce 9800 GX2

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 9800 GX2
Manufacturer nVidia nVidia
Year Nov 2006 Mar 2008
Code Name G80 G92
Memory 768 MB 512 MB (x2)
Core Speed 575 MHz 600 MHz (x2)
Memory Speed 1800 MHz 2000 MHz (x2)
Power (Max TDP) 155 watts 197 watts
Bandwidth 86400 MB/sec 128000 MB/sec
Texel Rate 36800 Mtexels/sec 76800 Mtexels/sec
Pixel Rate 13800 Mpixels/sec 19200 Mpixels/sec
Unified Shaders 128 128 (x2)
Texture Mapping Units 64 64 (x2)
Render Output Units 24 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 384-bit 256-bit (x2)
Fab Process 90 nm 65 nm
Transistors 681 million 754 million
Bus PCIe x16 PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 processed per second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce 8800 GTX

Amazon.com

Check prices at:

GeForce 9800 GX2

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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