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GeForce 9800 GT 512MB vs GeForce 9800 GX2

Intro

The GeForce 9800 GT 512MB uses a 65/55 nm design. nVidia has clocked the core frequency at 600 MHz. The GDDR3 RAM works at a frequency of 900 MHz on this specific model. It features 112 SPUs as well as 56 TAUs and 16 Rasterization Operator Units.

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

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GT 512MB 105 Watts
GeForce 9800 GX2 197 Watts
Difference: 92 Watts (88%)

Memory Bandwidth

As far as performance goes, the GeForce 9800 GX2 should theoretically be much better than the GeForce 9800 GT 512MB in general. (explain)

GeForce 9800 GX2 128000 MB/sec
GeForce 9800 GT 512MB 57600 MB/sec
Difference: 70400 (122%)

Texel Rate

The GeForce 9800 GX2 should be a lot (approximately 129%) faster with regards to anisotropic filtering than the GeForce 9800 GT 512MB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce 9800 GT 512MB 33600 Mtexels/sec
Difference: 43200 (129%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 9800 GX2 is superior to the GeForce 9800 GT 512MB, by a large margin. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
GeForce 9800 GT 512MB 9600 Mpixels/sec
Difference: 9600 (100%)

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 9800 GT 512MB

Amazon.com

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GeForce 9800 GX2

Amazon.com

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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 9800 GT 512MB GeForce 9800 GX2
Manufacturer nVidia nVidia
Year July 2008 Mar 2008
Code Name G92a/b G92
Memory 512 MB 512 MB (x2)
Core Speed 600 MHz 600 MHz (x2)
Memory Speed 1800 MHz 2000 MHz (x2)
Power (Max TDP) 105 watts 197 watts
Bandwidth 57600 MB/sec 128000 MB/sec
Texel Rate 33600 Mtexels/sec 76800 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 19200 Mpixels/sec
Unified Shaders 112 128 (x2)
Texture Mapping Units 56 64 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 65/55 nm 65 nm
Transistors 754 million 754 million
Bus PCIe x16 2.0 PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce 9800 GT 512MB

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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