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Radeon HD 6770 vs Radeon HD 7870
Intro
The Radeon HD 6770 has core speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 RAM. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.Compare those specs to the Radeon HD 7870, which features core 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 TAUs and 32 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6770 |
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108 Watts |
| Radeon HD 7870 |
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175 Watts |
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Memory Bandwidth
Performance-wise, the Radeon HD 7870 should theoretically be quite a bit superior to the Radeon HD 6770 overall. (explain)
| Radeon HD 7870 |
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153600 MB/sec |
| Radeon HD 6770 |
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67200 MB/sec |
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Texel Rate
The Radeon HD 7870 is quite a bit (more or less 122%) better at AF than the Radeon HD 6770. (explain)| Radeon HD 7870 |
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80000 Mtexels/sec |
| Radeon HD 6770 |
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36000 Mtexels/sec |
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Pixel Rate
If using high levels of AA is important to you, then the Radeon HD 7870 is superior to the Radeon HD 6770, and very much so. (explain)| Radeon HD 7870 |
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32000 Mpixels/sec |
| Radeon HD 6770 |
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14400 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 6770Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 7870Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | Radeon HD 6770 | Radeon HD 7870 |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | January 2011 | March 2012 |
| Code Name | Juniper XT | Pitcairn XT |
| Fab Process | 40 nm | 28 nm |
| Bus | PCIe x16 | PCIe 3.0 x16 |
| Memory | 512 MB | 2048 MB |
| Core Speed | 900 MHz | 1000 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 1050 MHz (4200 MHz effective) | 1200 MHz (4800 MHz effective) |
| Unified Shaders | 800 | 1280 |
| Texture Mapping Units | 40 | 80 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 128-bit | 256-bit |
| DirectX Version | DirectX 11 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.1 | OpenGL 4.2 |
| Power (Max TDP) | 108 watts | 175 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 67200 MB/sec | 153600 MB/sec |
| Texel Rate | 36000 Mtexels/sec | 80000 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 32000 Mpixels/sec |
Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the interface 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 4 instead. The higher the memory bandwidth, the faster 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 per second. This figure is calculated by multiplying the total number 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 per second.
Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.
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