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Geforce GTX 680 vs Radeon HD 4870 X2
Intro
The Geforce GTX 680 makes use of a 28 nm design. nVidia has clocked the core speed at 1006 MHz. The GDDR5 RAM is set to run at a frequency of 1502 MHz on this particular model. It features 1536 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.Compare those specs to the Radeon HD 4870 X2, which makes use of a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 memory works at a frequency of 900 MHz on this card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Geforce GTX 680 |
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195 Watts |
| Radeon HD 4870 X2 |
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350 Watts |
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Memory Bandwidth
The Radeon HD 4870 X2 should in theory perform a small bit faster than the Geforce GTX 680 in general. (explain)
| Radeon HD 4870 X2 |
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230400 MB/sec |
| Geforce GTX 680 |
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192256 MB/sec |
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Texel Rate
The Geforce GTX 680 should be much (approximately 115%) more effective at AF than the Radeon HD 4870 X2. (explain)| Geforce GTX 680 |
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128768 Mtexels/sec |
| Radeon HD 4870 X2 |
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60000 Mtexels/sec |
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Pixel Rate
If running with lots of anti-aliasing is important to you, then the Geforce GTX 680 is the winner, by far. (explain)| Geforce GTX 680 |
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32192 Mpixels/sec |
| Radeon HD 4870 X2 |
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24000 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.
One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.
Price Comparison
Geforce GTX 680Amazon.com
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Radeon HD 4870 X2Amazon.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 GTX 680 | Radeon HD 4870 X2 |
|---|---|---|
| Manufacturer | nVidia | AMD |
| Year | March 2012 | Aug 12, 2008 |
| Code Name | GK104 | R700 |
| Memory | 2048 MB | 1024 MB (x2) |
| Core Speed | 1006 MHz | 750 MHz (x2) |
| Memory Speed | 6008 MHz | 3600 MHz (x2) |
| Power (Max TDP) | 195 watts | 350 watts |
| Bandwidth | 192256 MB/sec | 230400 MB/sec |
| Texel Rate | 128768 Mtexels/sec | 60000 Mtexels/sec |
| Pixel Rate | 32192 Mpixels/sec | 24000 Mpixels/sec |
| Unified Shaders | 1536 | 800(160x5) (x2) |
| Texture Mapping Units | 128 | 40 (x2) |
| Render Output Units | 32 | 16 (x2) |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit (x2) |
| Fab Process | 28 nm | 55 nm |
| Transistors | 3540 million | 956 million |
| Bus | PCIe 3.0 x16 | PCIe 2.0 x16 (PCIe bridge) |
| DirectX Version | DirectX 11.0 | DirectX 10.1 |
| OpenGL Version | OpenGL 4.2 | OpenGL 3.0 |
Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.
Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.
Geforce GTX 680Amazon.com
Check prices at:
|
Radeon HD 4870 X2Amazon.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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