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GeForce 9800 GX2 vs GeForce GTX 285 2GB

Intro

The GeForce 9800 GX2 features a GPU core speed of 600 MHz, and the 512 MB of GDDR3 memory is set to run at 1000 MHz through a 256-bit bus. It also is comprised of 128 Stream Processors, 64 Texture Address Units, and 16 Raster Operation Units.

Compare all of that to the GeForce GTX 285 2GB, which features a GPU core clock speed of 648 MHz, and 2048 MB of GDDR3 memory set to run at 1242 MHz through a 512-bit bus. It also is made up of 240 Stream Processors, 80 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GX2 197 Watts
GeForce GTX 285 2GB 204 Watts
Difference: 7 Watts (4%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 2GB should perform a lot faster than the GeForce 9800 GX2 overall. (explain)

GeForce GTX 285 2GB 158976 MB/sec
GeForce 9800 GX2 128000 MB/sec
Difference: 30976 (24%)

Texel Rate

The GeForce 9800 GX2 should be much (more or less 48%) faster with regards to anisotropic filtering than the GeForce GTX 285 2GB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce GTX 285 2GB 51840 Mtexels/sec
Difference: 24960 (48%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 285 2GB is a better choice, not by a very large margin though. (explain)

GeForce GTX 285 2GB 20736 Mpixels/sec
GeForce 9800 GX2 19200 Mpixels/sec
Difference: 1536 (8%)

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 GX2

Amazon.com

Check prices at:

GeForce GTX 285 2GB

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

Display Specifications

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Model GeForce 9800 GX2 GeForce GTX 285 2GB
Manufacturer nVidia nVidia
Year Mar 2008 January 15, 2009
Code Name G92 G200b
Memory 512 MB (x2) 2048 MB
Core Speed 600 MHz (x2) 648 MHz
Memory Speed 2000 MHz (x2) 2484 MHz
Power (Max TDP) 197 watts 204 watts
Bandwidth 128000 MB/sec 158976 MB/sec
Texel Rate 76800 Mtexels/sec 51840 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 20736 Mpixels/sec
Unified Shaders 128 (x2) 240
Texture Mapping Units 64 (x2) 80
Render Output Units 16 (x2) 32
Bus Type GDDR3 GDDR3
Bus Width 256-bit (x2) 512-bit
Fab Process 65 nm 55 nm
Transistors 754 million 1400 million
Bus PCIe x16 2.0 PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be moved past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 are processed per second. This is worked out by multiplying the total amount of texture units by the core clock 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 one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock 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 rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 9800 GX2

Amazon.com

Check prices at:

GeForce GTX 285 2GB

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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