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GeForce 9800 GT 1GB vs GeForce 9800 GT 512MB
Intro
The GeForce 9800 GT 1GB has a clock frequency of 600 MHz and a GDDR3 memory speed of 900 MHz. It also features a 256-bit bus, and makes use of a 65/55 nm design. It is made up of 112 SPUs, 56 Texture Address Units, and 16 ROPs.Compare all that to the GeForce 9800 GT 512MB, which features a core clock speed of 600 MHz and a GDDR3 memory speed of 900 MHz. It also features a 256-bit bus, and makes use of a 65/55 nm design. It is comprised of 112 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Both cards have the same power consumption.Memory Bandwidth
Both cards have the exact same memory bandwidth, so theoretically they should have the same performance. (explain)
Texel Rate
Both cards have the exact same texel rate, so theoretically they should be equally good at at anisotropic filtering. (explain)Pixel Rate
Both cards have the exact same pixel fill rate, so theoretically they should be equally good at at 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 9800 GT 1GBAmazon.com
Other US-based stores
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GeForce 9800 GT 512MBAmazon.com
Other US-based stores
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Specifications
| Model | GeForce 9800 GT 1GB | GeForce 9800 GT 512MB |
|---|---|---|
| Manufacturer | nVidia | nVidia |
| Year | July 2008 | July 2008 |
| Code Name | G92a/b | G92a/b |
| Fab Process | 65/55 nm | 65/55 nm |
| Bus | PCIe x16 2.0 | PCIe x16 2.0 |
| Memory | 1024 MB | 512 MB |
| Core Speed | 600 MHz | 600 MHz |
| Shader Speed | 1500 MHz | 1500 MHz |
| Memory Speed | 900 MHz (1800 MHz effective) | 900 MHz (1800 MHz effective) |
| Unified Shaders | 112 | 112 |
| Texture Mapping Units | 56 | 56 |
| Render Output Units | 16 | 16 |
| Bus Type | GDDR3 | GDDR3 |
| Bus Width | 256-bit | 256-bit |
| DirectX Version | DirectX 10 | DirectX 10 |
| OpenGL Version | OpenGL 3.0 | OpenGL 3.0 |
| Power (Max TDP) | 105 watts | 105 watts |
| Shader Model | 4.0 | 4.0 |
| Bandwidth | 57600 MB/sec | 57600 MB/sec |
| Texel Rate | 33600 Mtexels/sec | 33600 Mtexels/sec |
| Pixel Rate | 9600 Mpixels/sec | 9600 Mpixels/sec |
Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 can be applied in one second. This is worked out by multiplying the total texture units by the core 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 applied in one second.
Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably 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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