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GeForce 9800 GT 1GB vs GeForce GT 640 DDR3
Intro
The GeForce 9800 GT 1GB comes with core speeds of 600 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR3 RAM. It features 112 SPUs as well as 56 Texture Address Units and 16 ROPs.Compare that to the GeForce GT 640 DDR3, which makes use of a 28 nm design. nVidia has clocked the core speed at 900 MHz. The DDR3 RAM works at a frequency of 1782 MHz on this particular model. It features 384 SPUs along with 32 TAUs and 16 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| GeForce GT 640 DDR3 |
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65 Watts |
| GeForce 9800 GT 1GB |
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105 Watts |
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Memory Bandwidth
Theoretically speaking, the GeForce 9800 GT 1GB should be 1% faster than the GeForce GT 640 DDR3 in general, because of its higher data rate. (explain)
| GeForce 9800 GT 1GB |
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57600 MB/sec |
| GeForce GT 640 DDR3 |
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57024 MB/sec |
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Texel Rate
The GeForce 9800 GT 1GB should be a bit (about 17%) more effective at AF than the GeForce GT 640 DDR3. (explain)| GeForce 9800 GT 1GB |
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33600 Mtexels/sec |
| GeForce GT 640 DDR3 |
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28800 Mtexels/sec |
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Pixel Rate
The GeForce GT 640 DDR3 is a lot (approximately 50%) more effective at full screen anti-aliasing than the GeForce 9800 GT 1GB, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)| GeForce GT 640 DDR3 |
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14400 Mpixels/sec |
| GeForce 9800 GT 1GB |
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9600 Mpixels/sec |
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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
GeForce 9800 GT 1GBAmazon.com
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GeForce GT 640 DDR3Amazon.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
| Model | GeForce 9800 GT 1GB | GeForce GT 640 DDR3 |
|---|---|---|
| Manufacturer | nVidia | nVidia |
| Year | July 2008 | June 2012 |
| Code Name | G92a/b | GK107 |
| Fab Process | 65/55 nm | 28 nm |
| Bus | PCIe x16 2.0 | PCIe 3.0 x16 |
| Memory | 1024 MB | 2048 MB |
| Core Speed | 600 MHz | 900 MHz |
| Shader Speed | 1500 MHz | 900 MHz |
| Memory Speed | 900 MHz (1800 MHz effective) | 1782 MHz (3564 MHz effective) |
| Unified Shaders | 112 | 384 |
| Texture Mapping Units | 56 | 32 |
| Render Output Units | 16 | 16 |
| Bus Type | GDDR3 | DDR3 |
| Bus Width | 256-bit | 128-bit |
| DirectX Version | DirectX 10 | DirectX 11.0 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.2 |
| Power (Max TDP) | 105 watts | 65 watts |
| Shader Model | 4.0 | 5.0 |
| Bandwidth | 57600 MB/sec | 57024 MB/sec |
| Texel Rate | 33600 Mtexels/sec | 28800 Mtexels/sec |
| Pixel Rate | 9600 Mpixels/sec | 14400 Mpixels/sec |
Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 applied per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.
Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's 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 output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.
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