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Radeon HD 5870 vs Radeon HD 6870
Intro
The Radeon HD 5870 has clock speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 RAM. It features 1600(320x5) SPUs as well as 80 Texture Address Units and 32 Rasterization Operator Units.Compare those specs to the Radeon HD 6870, which comes with a core clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 1120 SPUs, 56 TAUs, and 32 Raster Operation Units.
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
As far as performance goes, the Radeon HD 5870 should in theory be a bit superior to the Radeon HD 6870 overall. (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 will be quite a bit (approximately 35%) faster with regards to 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
If using high levels of AA is important to you, then the Radeon HD 6870 is the winner, though not by far. (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 data (counted in MB per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.
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