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Radeon HD 6770 vs Radeon HD 6870
Intro
The Radeon HD 6770 uses a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM runs at a speed of 1050 MHz on this model. It features 800 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.Compare those specs to the Radeon HD 6870, which makes use of a 40 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 memory works at a frequency of 1050 MHz on this card. It features 1120 SPUs as well as 56 TAUs 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 6770 |
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1520 points |
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Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6770 |
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108 Watts |
| Radeon HD 6870 |
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151 Watts |
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Memory Bandwidth
Theoretically, the Radeon HD 6870 should be much faster than the Radeon HD 6770 overall. (explain)
| Radeon HD 6870 |
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134400 MB/sec |
| Radeon HD 6770 |
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67200 MB/sec |
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Texel Rate
The Radeon HD 6870 is much (more or less 40%) faster with regards to AF than the Radeon HD 6770. (explain)| Radeon HD 6870 |
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50400 Mtexels/sec |
| Radeon HD 6770 |
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36000 Mtexels/sec |
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Pixel Rate
The Radeon HD 6870 is a lot (about 100%) more effective at full screen anti-aliasing than the Radeon HD 6770, and should be able to handle higher screen resolutions while still performing well. (explain)| Radeon HD 6870 |
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28800 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
Radeon HD 6770Amazon.com
Check prices at:
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Radeon HD 6870Amazon.com
Check prices at:
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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 6770 | Radeon HD 6870 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | January 2011 | October 2010 |
| Code Name | Juniper XT | Barts XT |
| Memory | 512 MB | 1024 MB |
| Core Speed | 900 MHz | 900 MHz |
| Memory Speed | 4200 MHz | 4200 MHz |
| Power (Max TDP) | 108 watts | 151 watts |
| Bandwidth | 67200 MB/sec | 134400 MB/sec |
| Texel Rate | 36000 Mtexels/sec | 50400 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 28800 Mpixels/sec |
| Unified Shaders | 800 | 1120 |
| Texture Mapping Units | 40 | 56 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 128-bit | 256-bit |
| Fab Process | 40 nm | 40 nm |
| Transistors | 1040 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 largest amount of information (counted in megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.
Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated 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 filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.
Radeon HD 6770Amazon.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.
|
Comments
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