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Radeon HD 7870 vs Radeon R9 270
Intro
The Radeon HD 7870 comes with a GPU clock speed of 1000 MHz, and the 2048 MB of GDDR5 memory is set to run at 1200 MHz through a 256-bit bus. It also features 1280 Stream Processors, 80 TAUs, and 32 ROPs.Compare those specs to the Radeon R9 270, which has a GPU core clock speed of 900 MHz, and 2048 MB of GDDR5 memory set to run at 1400 MHz through a 256-bit bus. It also is comprised of 1280 Stream Processors, 80 TAUs, and 32 ROPs.
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
Theoretically speaking, the Radeon R9 270 will be 17% quicker than the Radeon HD 7870 in general, because of its greater data rate. (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 is a small bit (about 11%) better at anisotropic 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
The Radeon HD 7870 will be a small bit (approximately 11%) more effective at FSAA than the Radeon R9 270, and should be able to handle higher resolutions without slowing down too much. (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: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the 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 amount of 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 speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.
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