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GeForce 9800 GTX vs GeForce 9800 GX2

Intro

The GeForce 9800 GTX has a clock frequency of 675 MHz and a GDDR3 memory speed of 1100 MHz. It also features a 256-bit bus, and uses a 65 nm design. It is made up of 128 SPUs, 64 TAUs, and 16 ROPs.

Compare all that 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 works at a frequency of 1000 MHz on this specific model. It features 128 SPUs as well as 64 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GTX 140 Watts
GeForce 9800 GX2 197 Watts
Difference: 57 Watts (41%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 is 82% faster than the GeForce 9800 GTX overall, due to its greater bandwidth. (explain)

GeForce 9800 GX2 128000 MB/sec
GeForce 9800 GTX 70400 MB/sec
Difference: 57600 (82%)

Texel Rate

The GeForce 9800 GX2 is quite a bit (about 78%) better at AF than the GeForce 9800 GTX. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce 9800 GTX 43200 Mtexels/sec
Difference: 33600 (78%)

Pixel Rate

The GeForce 9800 GX2 should be much (more or less 78%) faster with regards to FSAA than the GeForce 9800 GTX, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
GeForce 9800 GTX 10800 Mpixels/sec
Difference: 8400 (78%)

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 GTX

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 GTX GeForce 9800 GX2
Manufacturer nVidia nVidia
Year April 2008 Mar 2008
Code Name G92 G92
Memory 512 MB 512 MB (x2)
Core Speed 675 MHz 600 MHz (x2)
Memory Speed 2200 MHz 2000 MHz (x2)
Power (Max TDP) 140 watts 197 watts
Bandwidth 70400 MB/sec 128000 MB/sec
Texel Rate 43200 Mtexels/sec 76800 Mtexels/sec
Pixel Rate 10800 Mpixels/sec 19200 Mpixels/sec
Unified Shaders 128 128 (x2)
Texture Mapping Units 64 64 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 65 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: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output 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

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GeForce 9800 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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