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GeForce 8800 GTX vs GeForce 9800 GX2

Intro

The GeForce 8800 GTX has a core clock frequency of 575 MHz and a GDDR3 memory speed of 900 MHz. It also features a 384-bit bus, and makes use of a 90 nm design. It is made up of 128 SPUs, 64 Texture Address Units, and 24 Raster Operation Units.

Compare those specifications to the GeForce 9800 GX2, which makes use of a 65 nm design. nVidia has clocked the core frequency at 600 MHz. The GDDR3 RAM runs at a frequency of 1000 MHz on this model. It features 128 SPUs along with 64 TAUs and 16 Rasterization Operator Units.

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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

The GeForce 9800 GX2 should in theory be 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 should be much (approximately 109%) more effective at AF than the GeForce 8800 GTX. (explain)

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

Pixel Rate

The GeForce 9800 GX2 should be a lot (approximately 39%) more effective at full screen anti-aliasing than the GeForce 8800 GTX, and also will be capable of handling higher screen resolutions without slowing down too much. (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: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, it should 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, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs 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 output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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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.

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