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Radeon HD 6850 vs Radeon HD 6870
Intro
The Radeon HD 6850 features a core clock frequency of 775 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 256-bit bus, and uses a 40 nm design. It is comprised of 960 SPUs, 48 Texture Address Units, and 32 Raster Operation Units.Compare that to the Radeon HD 6870, which makes use of a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM is set to run at a speed of 1050 MHz on this model. It features 1120 SPUs along with 56 Texture Address Units and 32 ROPs.
Benchmarks
These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.
3DMark Fire Strike Graphics Score
| Radeon HD 6870 |
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2870 points |
| Radeon HD 6850 |
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2395 points |
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Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6850 |
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127 Watts |
| Radeon HD 6870 |
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151 Watts |
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Memory Bandwidth
Theoretically, the Radeon HD 6870 should perform a bit faster than the Radeon HD 6850 in general. (explain)
| Radeon HD 6870 |
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134400 MB/sec |
| Radeon HD 6850 |
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128000 MB/sec |
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Texel Rate
The Radeon HD 6870 is much (about 35%) faster with regards to AF than the Radeon HD 6850. (explain)| Radeon HD 6870 |
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50400 Mtexels/sec |
| Radeon HD 6850 |
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37200 Mtexels/sec |
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Pixel Rate
The Radeon HD 6870 is a bit (approximately 16%) more effective at anti-aliasing than the Radeon HD 6850, and should be capable of handling higher screen resolutions better. (explain)| Radeon HD 6870 |
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28800 Mpixels/sec |
| Radeon HD 6850 |
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24800 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 6850Amazon.com
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Radeon HD 6870Amazon.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 6850 | Radeon HD 6870 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | October 2010 | October 2010 |
| Code Name | Barts Pro | Barts XT |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 775 MHz | 900 MHz |
| Memory Speed | 4000 MHz | 4200 MHz |
| Power (Max TDP) | 127 watts | 151 watts |
| Bandwidth | 128000 MB/sec | 134400 MB/sec |
| Texel Rate | 37200 Mtexels/sec | 50400 Mtexels/sec |
| Pixel Rate | 24800 Mpixels/sec | 28800 Mpixels/sec |
| Unified Shaders | 960 | 1120 |
| Texture Mapping Units | 48 | 56 |
| Render Output Units | 32 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit |
| Fab Process | 40 nm | 40 nm |
| Transistors | 1700 million | 1700 million |
| Bus | PCIe x16 | PCIe x16 |
| DirectX Version | DirectX 11 | DirectX 11 |
| OpenGL Version | OpenGL 4.1 | OpenGL 4.1 |
Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 are applied in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one 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 worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.
Radeon HD 6850Amazon.com
Check prices at:
|
Radeon HD 6870Amazon.com
Check prices at:
|
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.
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Comments
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