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Radeon HD 7870 vs Radeon HD 7950
Intro
The Radeon HD 7870 uses a 28 nm design. ATi has clocked the core frequency at 1000 MHz. The GDDR5 memory works at a speed of 1200 MHz on this particular model. It features 1280 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.Compare those specifications to the Radeon HD 7950, which has a core clock frequency of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 384-bit bus, and makes use of a 28 nm design. It features 1792 SPUs, 112 Texture Address Units, and 32 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7870 |
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175 Watts |
| Radeon HD 7950 |
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200 Watts |
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Memory Bandwidth
In theory, the Radeon HD 7950 will be 56% faster than the Radeon HD 7870 overall, due to its higher data rate. (explain)
| Radeon HD 7950 |
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240000 MB/sec |
| Radeon HD 7870 |
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153600 MB/sec |
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Texel Rate
The Radeon HD 7950 will be a bit (more or less 12%) faster with regards to anisotropic filtering than the Radeon HD 7870. (explain)| Radeon HD 7950 |
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89600 Mtexels/sec |
| Radeon HD 7870 |
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80000 Mtexels/sec |
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Pixel Rate
The Radeon HD 7870 is much (more or less 25%) more effective at AA than the Radeon HD 7950, and capable of handling higher resolutions more effectively. (explain)| Radeon HD 7870 |
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32000 Mpixels/sec |
| Radeon HD 7950 |
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25600 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 7870Amazon.com
Other US-based stores
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Radeon HD 7950Amazon.com
Other US-based stores
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Specifications
| Model | Radeon HD 7870 | Radeon HD 7950 |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | March 2012 | January 2012 |
| Code Name | Pitcairn XT | Tahiti Pro |
| Fab Process | 28 nm | 28 nm |
| Bus | PCIe 3.0 x16 | PCIe 3.0 x16 |
| Memory | 2048 MB | 1536 MB |
| Core Speed | 1000 MHz | 800 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 1200 MHz (4800 MHz effective) | 1250 MHz (5000 MHz effective) |
| Unified Shaders | 1280 | 1792 |
| Texture Mapping Units | 80 | 112 |
| Render Output Units | 32 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 384-bit |
| DirectX Version | DirectX 11.1 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.2 | OpenGL 4.2 |
| Power (Max TDP) | 175 watts | 200 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 153600 MB/sec | 240000 MB/sec |
| Texel Rate | 80000 Mtexels/sec | 89600 Mtexels/sec |
| Pixel Rate | 32000 Mpixels/sec | 25600 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one 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 better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.
Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.
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