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Radeon HD 6870 vs Radeon HD 7770
Intro
The Radeon HD 6870 has core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 1120 SPUs along with 56 Texture Address Units and 32 ROPs.Compare that to the Radeon HD 7770, which comes with a clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 TAUs, and 16 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 7770 |
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3180 points |
| Radeon HD 6870 |
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2870 points |
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Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7770 |
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80 Watts |
| Radeon HD 6870 |
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151 Watts |
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Memory Bandwidth
The Radeon HD 6870 should in theory be much faster than the Radeon HD 7770 overall. (explain)
| Radeon HD 6870 |
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134400 MB/sec |
| Radeon HD 7770 |
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72000 MB/sec |
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Texel Rate
The Radeon HD 6870 is much (more or less 26%) more effective at texture filtering than the Radeon HD 7770. (explain)| Radeon HD 6870 |
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50400 Mtexels/sec |
| Radeon HD 7770 |
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40000 Mtexels/sec |
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Pixel Rate
The Radeon HD 6870 should be a lot (approximately 80%) faster with regards to FSAA than the Radeon HD 7770, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)| Radeon HD 6870 |
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28800 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
Radeon HD 6870Amazon.com
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Radeon HD 7770Amazon.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 6870 | Radeon HD 7770 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | October 2010 | February 2012 |
| Code Name | Barts XT | Cape Verde XT |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 900 MHz | 1000 MHz |
| Memory Speed | 4200 MHz | 4500 MHz |
| Power (Max TDP) | 151 watts | 80 watts |
| Bandwidth | 134400 MB/sec | 72000 MB/sec |
| Texel Rate | 50400 Mtexels/sec | 40000 Mtexels/sec |
| Pixel Rate | 28800 Mpixels/sec | 16000 Mpixels/sec |
| Unified Shaders | 1120 | 640 |
| Texture Mapping Units | 56 | 40 |
| Render Output Units | 32 | 16 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 128-bit |
| Fab Process | 40 nm | 28 nm |
| Transistors | 1700 million | 1500 million |
| Bus | PCIe x16 | PCIe 3.0 x16 |
| DirectX Version | DirectX 11 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.1 | OpenGL 4.2 |
Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 once 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 AA, High Dynamic Range 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 calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.
Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.
Radeon HD 6870Amazon.com
Check prices at:
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Radeon HD 7770Amazon.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
3 Responses to “Radeon HD 6870 vs Radeon HD 7770”Are you using pice 2 or pcie 3
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It would have to be PCI-e 2.0 or 2.1 because the 6970 doesn't support PCI-e 3.0, and the theoretical benchmarks are not dependent on PCI-e speed. Anyway, you should get the 6870 instead of the 7770, the 68xx series has the BEST price to performance ratio of ANY AMD/ATI radeon HD graphics card.
[...] HD 6870 will be a lot (approximately 26%) faster with regards to AF than the Radeon HD 7770. (explain)Radeon HD 6870 50400 Mtexels/sec Radeon HD 7770 40000 Mtexels/sec Difference: 10400 (26%) [...]