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GeForce 8800 GTS (G80) 320MB vs GeForce 8800 GTS (G80) 640MB
Intro
The GeForce 8800 GTS (G80) 320MB features core clock speeds of 513 MHz on the GPU, and 792 MHz on the 320 MB of GDDR3 memory. It features 96 SPUs along with 48 Texture Address Units and 20 ROPs.Compare that to the GeForce 8800 GTS (G80) 640MB, which has GPU core speed of 513 MHz, and 640 MB of GDDR3 RAM running at 792 MHz through a 320-bit bus. It also is made up of 96 SPUs, 48 Texture Address Units, and 20 ROPs.
Power Usage and Theoretical Benchmarks
Both cards have the same power consumption.Memory Bandwidth
Both cards have exactly the same memory bandwidth, so theoretically they should perform the same. (explain)
Texel Rate
Both cards have the exact same texel fill rate, so theoretically they should perform equally good at at anisotropic filtering. (explain)Pixel Rate
Both cards have exactly the same pixel fill rate, so in theory they should be equally good at at FSAA, and be able to handle the same 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
GeForce 8800 GTS (G80) 320MBAmazon.com
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GeForce 8800 GTS (G80) 640MBAmazon.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 8800 GTS (G80) 320MB | GeForce 8800 GTS (G80) 640MB |
|---|---|---|
| Manufacturer | nVidia | nVidia |
| Year | Feb 2007 | Nov 2006 (640) |
| Code Name | G80 | G80 |
| Memory | 320 MB | 640 MB |
| Core Speed | 513 MHz | 513 MHz |
| Memory Speed | 1584 MHz | 1584 MHz |
| Power (Max TDP) | 143 watts | 143 watts |
| Bandwidth | 63360 MB/sec | 63360 MB/sec |
| Texel Rate | 24624 Mtexels/sec | 24624 Mtexels/sec |
| Pixel Rate | 10260 Mpixels/sec | 10260 Mpixels/sec |
| Unified Shaders | 96 | 96 |
| Texture Mapping Units | 48 | 48 |
| Render Output Units | 20 | 20 |
| Bus Type | GDDR3 | GDDR3 |
| Bus Width | 320-bit | 320-bit |
| Fab Process | 90 nm | 90 nm |
| Transistors | 681 million | 681 million |
| Bus | PCIe x16 | PCIe x16 |
| DirectX Version | DirectX 10 | DirectX 10 |
| OpenGL Version | OpenGL 3.0 | OpenGL 3.0 |
Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once 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 amount of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video 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 that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.
GeForce 8800 GTS (G80) 320MBAmazon.com
Check prices at:
|
GeForce 8800 GTS (G80) 640MBAmazon.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.
|
Comments
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