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GeForce 9800 GX2 vs GeForce GTX 285 2GB

Intro

The GeForce 9800 GX2 makes use of a 65 nm design. nVidia has clocked the core frequency at 600 MHz. The GDDR3 memory is set to run at a frequency of 1000 MHz on this card. It features 128 SPUs along with 64 Texture Address Units and 16 ROPs.

Compare that to the GeForce GTX 285 2GB, which comes with a clock frequency of 648 MHz and a GDDR3 memory frequency of 1242 MHz. It also uses a 512-bit bus, and makes use of a 55 nm design. It is comprised of 240 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

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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, the GeForce GTX 285 2GB should be quite a bit 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 will be a lot (more or less 48%) faster with regards to AF 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 lots of anti-aliasing is important to you, then the GeForce GTX 285 2GB is superior to the GeForce 9800 GX2, but not by far. (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

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GeForce GTX 285 2GB

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 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 data (counted in megabytes per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour 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 also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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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.

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