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GeForce GTX 285 1GB vs GeForce GTX 285 2GB
Intro
The GeForce GTX 285 1GB has a core clock speed of 648 MHz and a GDDR3 memory speed of 1242 MHz. It also features a 512-bit memory bus, and uses a 55 nm design. It is made up of 240 SPUs, 80 TAUs, and 32 ROPs.Compare all that to the GeForce GTX 285 2GB, which uses a 55 nm design. nVidia has clocked the core frequency at 648 MHz. The GDDR3 RAM runs at a frequency of 1242 MHz on this model. It features 240 SPUs along with 80 Texture Address Units and 32 ROPs.
Power Usage and Theoretical Benchmarks
Both cards have the same power consumption.Memory Bandwidth
Both cards have the exact same bandwidth, so theoretically they should have identical performance. (explain)
Texel Rate
Both cards have the exact same texel fill rate, so theoretically they should be equally good at at AF. (explain)Pixel Rate
Both cards have the exact same pixel rate, so theoretically they should be equally good at at full screen anti-aliasing, and be able to handle the same screen resolutions. (explain)
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
Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.
GeForce GTX 285 1GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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GeForce GTX 285 2GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | GeForce GTX 285 1GB | GeForce GTX 285 2GB |
|---|---|---|
| Manufacturer | nVidia | nVidia |
| Year | January 15, 2009 | January 15, 2009 |
| Code Name | G200b | G200b |
| Fab Process | 55 nm | 55 nm |
| Bus | PCIe x16 2.0 | PCIe x16 2.0 |
| Memory | 1024 MB | 2048 MB |
| Core Speed | 648 MHz | 648 MHz |
| Shader Speed | 1476 MHz | 1476 MHz |
| Memory Speed | 1242 MHz | 1242 MHz |
| Unified Shaders | 240 | 240 |
| Texture Mapping Units | 80 | 80 |
| Render Output Units | 32 | 32 |
| Bus Type | GDDR3 | GDDR3 |
| Bus Width | 512-bit | 512-bit |
| DirectX Version | DirectX 10 | DirectX 10 |
| OpenGL Version | OpenGL 3.1 | OpenGL 3.1 |
| Power (Max TDP) | 204 watts | 204 watts |
| Shader Model | 4.0 | 4.0 |
| Bandwidth | 158976 MB/sec | 158976 MB/sec |
| Texel Rate | 51840 Mtexels/sec | 51840 Mtexels/sec |
| Pixel Rate | 20736 Mpixels/sec | 20736 Mpixels/sec |
Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, 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 number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.
Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.
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