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Radeon HD 7870 vs Radeon R9 270
Intro
The Radeon HD 7870 uses a 28 nm design. ATi has clocked the core frequency at 1000 MHz. The GDDR5 RAM works at a speed of 1200 MHz on this card. It features 1280 SPUs along with 80 Texture Address Units and 32 ROPs.Compare all that to the Radeon R9 270, which makes use of a 28 nm design. ATi has set the core speed at 900 MHz. The GDDR5 memory works at a frequency of 1400 MHz on this card. It features 1280 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon R9 270 |
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150 Watts |
| Radeon HD 7870 |
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175 Watts |
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Memory Bandwidth
In theory, the Radeon R9 270 should be a little bit faster than the Radeon HD 7870 in general. (explain)
| Radeon R9 270 |
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179200 MB/sec |
| Radeon HD 7870 |
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153600 MB/sec |
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Texel Rate
The Radeon HD 7870 should be a little bit (more or less 11%) faster with regards to texture filtering than the Radeon R9 270. (explain)| Radeon HD 7870 |
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80000 Mtexels/sec |
| Radeon R9 270 |
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72000 Mtexels/sec |
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Pixel Rate
If using a high screen resolution is important to you, then the Radeon HD 7870 is the winner, not by a very large margin though. (explain)| Radeon HD 7870 |
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32000 Mpixels/sec |
| Radeon R9 270 |
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28800 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 R9 270Amazon.com
Other US-based stores
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Specifications
| Model | Radeon HD 7870 | Radeon R9 270 |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | March 2012 | November 2013 |
| Code Name | Pitcairn XT | Curacao Pro |
| Fab Process | 28 nm | 28 nm |
| Bus | PCIe 3.0 x16 | PCIe 3.0 x16 |
| Memory | 2048 MB | 2048 MB |
| Core Speed | 1000 MHz | 900 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 1200 MHz (4800 MHz effective) | 1400 MHz (5600 MHz effective) |
| Unified Shaders | 1280 | 1280 |
| Texture Mapping Units | 80 | 80 |
| Render Output Units | 32 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit |
| DirectX Version | DirectX 11.1 | DirectX 11.2 |
| OpenGL Version | OpenGL 4.2 | OpenGL 4.3 |
| Power (Max TDP) | 175 watts | 150 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 153600 MB/sec | 179200 MB/sec |
| Texel Rate | 80000 Mtexels/sec | 72000 Mtexels/sec |
| Pixel Rate | 32000 Mpixels/sec | 28800 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 is worked out by multiplying the total amount of texture units of the card by the core 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 processed per second.
Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the 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 drawing the pixels (image) on 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 potential to reach the maximum fill rate.
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