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GeForce 9800 GX2 vs GeForce GTX 285 1GB

Intro

The GeForce 9800 GX2 has core clock speeds of 600 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR3 RAM. It features 128 SPUs as well as 64 TAUs and 16 Rasterization Operator Units.

Compare all that to the GeForce GTX 285 1GB, which comes with a clock speed of 648 MHz and a GDDR3 memory speed of 1242 MHz. It also makes use of a 512-bit memory bus, and makes use of a 55 nm design. It features 240 SPUs, 80 TAUs, 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 1GB 204 Watts
Difference: 7 Watts (4%)

Memory Bandwidth

The GeForce GTX 285 1GB should in theory be quite a bit faster than the GeForce 9800 GX2 overall. (explain)

GeForce GTX 285 1GB 158976 MB/sec
GeForce 9800 GX2 128000 MB/sec
Difference: 30976 (24%)

Texel Rate

The GeForce 9800 GX2 will be quite a bit (more or less 48%) more effective at anisotropic filtering than the GeForce GTX 285 1GB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce GTX 285 1GB 51840 Mtexels/sec
Difference: 24960 (48%)

Pixel Rate

The GeForce GTX 285 1GB is a little bit (more or less 8%) better at FSAA than the GeForce 9800 GX2, and will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 285 1GB 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 1GB

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 GX2 GeForce GTX 285 1GB
Manufacturer nVidia nVidia
Year Mar 2008 January 15, 2009
Code Name G92 G200b
Memory 512 MB (x2) 1024 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: Bandwidth is the max amount of information (in units of MB per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 amount of texture map elements (texels) that are applied in one second. This number 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs 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 is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

GeForce 9800 GX2

Amazon.com

Check prices at:

GeForce GTX 285 1GB

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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