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GeForce GTX 280 vs GeForce GTX 285 2GB

Intro

The GeForce GTX 280 comes with a clock frequency of 602 MHz and a GDDR3 memory frequency of 1107 MHz. It also features a 512-bit bus, and uses a 65 nm design. It is made up of 240 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the GeForce GTX 285 2GB, which makes use of a 55 nm design. nVidia has set the core frequency at 648 MHz. The GDDR3 memory is set to run at a speed of 1242 MHz on this specific model. It features 240 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 285 2GB 204 Watts
GeForce GTX 280 236 Watts
Difference: 32 Watts (16%)

Memory Bandwidth

In theory, the GeForce GTX 285 2GB should be 12% faster than the GeForce GTX 280 overall, due to its higher data rate. (explain)

GeForce GTX 285 2GB 158976 MB/sec
GeForce GTX 280 141696 MB/sec
Difference: 17280 (12%)

Texel Rate

The GeForce GTX 285 2GB should be a small bit (approximately 8%) more effective at texture filtering than the GeForce GTX 280. (explain)

GeForce GTX 285 2GB 51840 Mtexels/sec
GeForce GTX 280 48160 Mtexels/sec
Difference: 3680 (8%)

Pixel Rate

The GeForce GTX 285 2GB will be just a bit (approximately 8%) better at anti-aliasing than the GeForce GTX 280, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 285 2GB 20736 Mpixels/sec
GeForce GTX 280 19264 Mpixels/sec
Difference: 1472 (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.

Price Comparison

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GeForce GTX 280

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

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Model GeForce GTX 280 GeForce GTX 285 2GB
Manufacturer nVidia nVidia
Year June 17, 2008 January 15, 2009
Code Name G200 G200b
Memory 1024 MB 2048 MB
Core Speed 602 MHz 648 MHz
Memory Speed 2214 MHz 2484 MHz
Power (Max TDP) 236 watts 204 watts
Bandwidth 141696 MB/sec 158976 MB/sec
Texel Rate 48160 Mtexels/sec 51840 Mtexels/sec
Pixel Rate 19264 Mpixels/sec 20736 Mpixels/sec
Unified Shaders 240 240
Texture Mapping Units 80 80
Render Output Units 32 32
Bus Type GDDR3 GDDR3
Bus Width 512-bit 512-bit
Fab Process 65 nm 55 nm
Transistors 1400 million 1400 million
Bus PCIe x16 2.0 PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.1 OpenGL 3.1

Memory Bandwidth: Bandwidth is the max amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce GTX 280

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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