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Radeon HD 5870 vs Radeon HD 6870
Intro
The Radeon HD 5870 uses a 40 nm design. ATi has clocked the core speed at 850 MHz. The GDDR5 memory is set to run at a frequency of 1200 MHz on this particular model. It features 1600(320x5) SPUs along with 80 TAUs and 32 Rasterization Operator Units.Compare those specs to the Radeon HD 6870, which makes use of a 40 nm design. ATi has clocked the core frequency at 900 MHz. The GDDR5 memory works at a frequency of 1050 MHz on this model. It features 1120 SPUs along with 56 TAUs and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6870 |
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151 Watts |
| Radeon HD 5870 |
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188 Watts |
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Memory Bandwidth
The Radeon HD 5870, in theory, should perform a little bit faster than the Radeon HD 6870 in general. (explain)
| Radeon HD 5870 |
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153600 MB/sec |
| Radeon HD 6870 |
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134400 MB/sec |
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Texel Rate
The Radeon HD 5870 is much (approximately 35%) more effective at texture filtering than the Radeon HD 6870. (explain)| Radeon HD 5870 |
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68000 Mtexels/sec |
| Radeon HD 6870 |
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50400 Mtexels/sec |
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Pixel Rate
The Radeon HD 6870 is a small bit (more or less 6%) faster with regards to anti-aliasing than the Radeon HD 5870, and should be able to handle higher screen resolutions more effectively. (explain)| Radeon HD 6870 |
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28800 Mpixels/sec |
| Radeon HD 5870 |
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27200 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
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.
Radeon HD 5870Amazon.com
Other US-based stores
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Radeon HD 6870Amazon.com
Other US-based stores
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Specifications
| Model | Radeon HD 5870 | Radeon HD 6870 |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | September 23, 2009 | October 2010 |
| Code Name | Cypress XT | Barts XT |
| Fab Process | 40 nm | 40 nm |
| Bus | PCIe 2.1 x16 | PCIe x16 |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 850 MHz | 900 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 1200 MHz (4800 MHz effective) | 1050 MHz (4200 MHz effective) |
| Unified Shaders | 1600(320x5) | 1120 |
| Texture Mapping Units | 80 | 56 |
| Render Output Units | 32 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit |
| DirectX Version | DirectX 11 | DirectX 11 |
| OpenGL Version | OpenGL 3.2 | OpenGL 4.1 |
| Power (Max TDP) | 188 watts | 151 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 153600 MB/sec | 134400 MB/sec |
| Texel Rate | 68000 Mtexels/sec | 50400 Mtexels/sec |
| Pixel Rate | 27200 Mpixels/sec | 28800 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.
Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in one 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 - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.
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