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GeForce 9800 GT 512MB vs GeForce 9800 GX2

Intro

The GeForce 9800 GT 512MB has core speeds of 600 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 112 SPUs along with 56 TAUs and 16 Rasterization Operator Units.

Compare all that to the GeForce 9800 GX2, which comes with GPU core speed of 600 MHz, and 512 MB of GDDR3 RAM running at 1000 MHz through a 256-bit bus. It also is made up of 128 SPUs, 64 TAUs, and 16 ROPs.

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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

The GeForce 9800 GX2, in theory, should be much faster than the GeForce 9800 GT 512MB overall. (explain)

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

Texel Rate

The GeForce 9800 GX2 will be quite a bit (approximately 129%) better at 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

The GeForce 9800 GX2 should be much (more or less 100%) better at anti-aliasing than the GeForce 9800 GT 512MB, and also should be able to handle higher resolutions better. (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

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 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 information (counted in megabytes per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant 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 maximum fill rate.

Display Prices

Hide Prices

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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