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Radeon HD 6770 vs Radeon HD 6870
Intro
The Radeon HD 6770 comes with a clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It is comprised of 800 SPUs, 40 TAUs, and 16 ROPs.Compare all of that to the Radeon HD 6870, which comes with core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 1120 SPUs as well as 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 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
The Radeon HD 6870 should in theory perform 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 should be much (about 40%) better at texture filtering 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 quite a bit (about 100%) better at full screen anti-aliasing than the Radeon HD 6770, and should be able to handle higher resolutions more effectively. (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 maximum amount of information (measured in MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum 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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