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Radeon HD 6790 vs Radeon HD 6870
Intro
The Radeon HD 6790 has a GPU core clock speed of 840 MHz, and the 1024 MB of GDDR5 RAM runs at 1050 MHz through a 256-bit bus. It also is comprised of 800 SPUs, 40 TAUs, and 16 ROPs.Compare those specs to the Radeon HD 6870, which features clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 1120 SPUs along with 56 TAUs and 32 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6790 |
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150 Watts |
| Radeon HD 6870 |
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151 Watts |
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Memory Bandwidth
Both cards have exactly the same bandwidth, so in theory they should perform exactly the same. (explain)
Texel Rate
The Radeon HD 6870 will be much (about 50%) faster with regards to texture filtering than the Radeon HD 6790. (explain)| Radeon HD 6870 |
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50400 Mtexels/sec |
| Radeon HD 6790 |
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33600 Mtexels/sec |
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Pixel Rate
The Radeon HD 6870 will be much (approximately 114%) faster with regards to anti-aliasing than the Radeon HD 6790, and also should be able to handle higher screen resolutions without losing too much performance. (explain)| Radeon HD 6870 |
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28800 Mpixels/sec |
| Radeon HD 6790 |
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13440 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 6790Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 6870Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | Radeon HD 6790 | Radeon HD 6870 |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | April 2011 | October 2010 |
| Code Name | Barts LE | Barts XT |
| Fab Process | 40 nm | 40 nm |
| Bus | PCIe 2.1 x16 | PCIe x16 |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 840 MHz | 900 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 1050 MHz (4200 MHz effective) | 1050 MHz (4200 MHz effective) |
| Unified Shaders | 800 | 1120 |
| Texture Mapping Units | 40 | 56 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit |
| DirectX Version | DirectX 11 | DirectX 11 |
| OpenGL Version | OpenGL 4.1 | OpenGL 4.1 |
| Power (Max TDP) | 150 watts | 151 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 134400 MB/sec | 134400 MB/sec |
| Texel Rate | 33600 Mtexels/sec | 50400 Mtexels/sec |
| Pixel Rate | 13440 Mpixels/sec | 28800 Mpixels/sec |
Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics 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 number of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units 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 fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.
Comments
3 Responses to “Radeon HD 6790 vs Radeon HD 6870”[...] but the build I recomended has a much faster video card. For gaming the video card is paramount. Theoritical benchmark comparison between the 2 video cards based on specs The AMD 955 is still a heck of a [...]
[...] A graphics card that is two product cycles ahead (AMD Radeon 6870 vs the top end Mac option of the 6790); see here for a comparison of raw benchmarks from each card [...]
Dual-6790 or Single-6870??