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Radeon HD 6850 vs Radeon HD 7770
Intro
The Radeon HD 6850 features core clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 960 SPUs along with 48 TAUs and 32 Rasterization Operator Units.Compare those specifications to the Radeon HD 7770, which has GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7770 |
|
80 Watts |
| Radeon HD 6850 |
|
127 Watts |
|
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Memory Bandwidth
Theoretically speaking, the Radeon HD 6850 should be 78% quicker than the Radeon HD 7770 overall, because of its higher bandwidth. (explain)
| Radeon HD 6850 |
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128000 MB/sec |
| Radeon HD 7770 |
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72000 MB/sec |
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Texel Rate
The Radeon HD 7770 should be a little bit (about 8%) more effective at texture filtering than the Radeon HD 6850. (explain)| Radeon HD 7770 |
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40000 Mtexels/sec |
| Radeon HD 6850 |
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37200 Mtexels/sec |
|
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Pixel Rate
The Radeon HD 6850 should be quite a bit (approximately 55%) more effective at AA than the Radeon HD 7770, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)| Radeon HD 6850 |
|
24800 Mpixels/sec |
| Radeon HD 7770 |
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16000 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 6850Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 7770Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | Radeon HD 6850 | Radeon HD 7770 |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | October 2010 | February 2012 |
| Code Name | Barts Pro | Cape Verde XT |
| Fab Process | 40 nm | 28 nm |
| Bus | PCIe x16 | PCIe 3.0 x16 |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 775 MHz | 1000 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 1000 MHz (4000 MHz effective) | 1125 MHz (4500 MHz effective) |
| Unified Shaders | 960 | 640 |
| Texture Mapping Units | 48 | 40 |
| Render Output Units | 32 | 16 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 128-bit |
| DirectX Version | DirectX 11 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.1 | OpenGL 4.2 |
| Power (Max TDP) | 127 watts | 80 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 128000 MB/sec | 72000 MB/sec |
| Texel Rate | 37200 Mtexels/sec | 40000 Mtexels/sec |
| Pixel Rate | 24800 Mpixels/sec | 16000 Mpixels/sec |
Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling 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 the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.
Comments
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