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Radeon HD 6990 vs Radeon HD 7970
Intro
The Radeon HD 6990 uses a 40 nm design. ATi has set the core speed at 830 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this model. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.Compare all of that to the Radeon HD 7970, which uses a 28 nm design. ATi has set the core speed at 925 MHz. The GDDR5 memory is set to run at a frequency of 1375 MHz on this specific model. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7970 |
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250 Watts |
| Radeon HD 6990 |
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375 Watts |
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Memory Bandwidth
Theoretically, the Radeon HD 6990 should be much faster than the Radeon HD 7970 overall. (explain)
| Radeon HD 6990 |
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320000 MB/sec |
| Radeon HD 7970 |
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264000 MB/sec |
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Texel Rate
The Radeon HD 6990 should be a lot (about 35%) better at anisotropic filtering than the Radeon HD 7970. (explain)| Radeon HD 6990 |
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159360 Mtexels/sec |
| Radeon HD 7970 |
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118400 Mtexels/sec |
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Pixel Rate
The Radeon HD 6990 should be quite a bit (approximately 79%) faster with regards to FSAA than the Radeon HD 7970, and also should be capable of handling higher resolutions without losing too much performance. (explain)| Radeon HD 6990 |
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53120 Mpixels/sec |
| Radeon HD 7970 |
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29600 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.
One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.
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 6990Amazon.com
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Radeon HD 7970Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | Radeon HD 6990 | Radeon HD 7970 |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | March 2011 | January 2012 |
| Code Name | Antilles | Tahiti XT |
| Fab Process | 40 nm | 28 nm |
| Bus | PCIe 2.1 x16 | PCIe 3.0 x16 |
| Memory | 2048 MB (x2) | 3072 MB |
| Core Speed | 830 MHz (x2) | 925 MHz |
| Shader Speed | N/A MHz (x2) | (N/A) MHz |
| Memory Speed | 1250 MHz (5000 MHz effective) (x2) | 1375 MHz (5500 MHz effective) |
| Unified Shaders | 1536 (x2) | 2048 |
| Texture Mapping Units | 96 (x2) | 128 |
| Render Output Units | 32 (x2) | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit (x2) | 384-bit |
| DirectX Version | DirectX 11 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.1 | OpenGL 4.2 |
| Power (Max TDP) | 375 watts | 250 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 320000 MB/sec | 264000 MB/sec |
| Texel Rate | 159360 Mtexels/sec | 118400 Mtexels/sec |
| Pixel Rate | 53120 Mpixels/sec | 29600 Mpixels/sec |
Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the 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 maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.
Comments
8 Responses to “Radeon HD 6990 vs Radeon HD 7970”LOL and i was just about to buy a 7970! imma going for a 6990
Is Superkewldude retarded?
Dont just look at performance look at the power consumtion too :l
OMG how about 6990 in crossfire!
if you look at the specs, really effective bandwidth would be better on the 7970 because of the PCIe 3.0 (providing you have a PCIe 3.0 compatible board) and it has better open GL 4.2 admittedly its only .1 better but thats the difference between playing BRINK and not playing BRINK.or any other game. and note too that the 6990 here has 2 cores where as the 7970 has one.
[...] que el Crossfire, porque con algunos juegos empeora el rendimiento. Para que te hagas idea: Radeon HD 6990 vs Radeon HD 7970 – Performance Comparison Benchmarks @ Hardware Compare Radeon HD 6950 vs Radeon HD 6990 – Performance Comparison Benchmarks @ Hardware Compare aqui [...]
i think, we should waiting for 7990
more fantastic than above.
I think, we should know that the 7990
will be expensive as FUUUUUUUUUUUUUUUUUUUUUUUU