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Radeon HD 7870 vs Radeon R9 270
Intro
The Radeon HD 7870 features core clock speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1280 SPUs as well as 80 Texture Address Units and 32 Rasterization Operator Units.Compare those specs to the Radeon R9 270, which features core clock speeds of 900 MHz on the GPU, and 1400 MHz on the 2048 MB of GDDR5 memory. It features 1280 SPUs as well as 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
The Radeon R9 270 should theoretically perform a small 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 (approximately 11%) better at AF 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 bit (more or less 11%) faster with regards to FSAA than the Radeon R9 270, and should be capable of handling higher resolutions without losing too much performance. (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
Radeon HD 7870Amazon.com
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Radeon R9 270Amazon.com
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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.
Specifications
| Model | Radeon HD 7870 | Radeon R9 270 |
|---|---|---|
| Manufacturer | AMD | AMD |
| 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 max amount of information (counted in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.
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