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Radeon HD 7770 vs Radeon HD 7870
Intro
The Radeon HD 7770 features a clock frequency of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 ROPs.Compare all that to the Radeon HD 7870, which features core clock speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1280 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.
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 7870 |
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6230 points |
| Radeon HD 7770 |
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3180 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 7870 |
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175 Watts |
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Memory Bandwidth
Theoretically, the Radeon HD 7870 should perform a lot faster than the Radeon HD 7770 overall. (explain)
| Radeon HD 7870 |
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153600 MB/sec |
| Radeon HD 7770 |
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72000 MB/sec |
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Texel Rate
The Radeon HD 7870 should be much (about 100%) more effective at AF than the Radeon HD 7770. (explain)| Radeon HD 7870 |
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80000 Mtexels/sec |
| Radeon HD 7770 |
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40000 Mtexels/sec |
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Pixel Rate
If using a high screen resolution is important to you, then the Radeon HD 7870 is the winner, and very much so. (explain)| Radeon HD 7870 |
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32000 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 7770Amazon.com
Check prices at:
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Radeon HD 7870Amazon.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 7770 | Radeon HD 7870 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | February 2012 | March 2012 |
| Code Name | Cape Verde XT | Pitcairn XT |
| Memory | 1024 MB | 2048 MB |
| Core Speed | 1000 MHz | 1000 MHz |
| Memory Speed | 4500 MHz | 4800 MHz |
| Power (Max TDP) | 80 watts | 175 watts |
| Bandwidth | 72000 MB/sec | 153600 MB/sec |
| Texel Rate | 40000 Mtexels/sec | 80000 Mtexels/sec |
| Pixel Rate | 16000 Mpixels/sec | 32000 Mpixels/sec |
| Unified Shaders | 640 | 1280 |
| Texture Mapping Units | 40 | 80 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 128-bit | 256-bit |
| Fab Process | 28 nm | 28 nm |
| Transistors | 1500 million | 2800 million |
| Bus | PCIe 3.0 x16 | PCIe 3.0 x16 |
| DirectX Version | DirectX 11.1 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.2 | OpenGL 4.2 |
Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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 of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.
Radeon HD 7770Amazon.com
Check prices at:
|
Radeon HD 7870Amazon.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
One Response to “Radeon HD 7770 vs Radeon HD 7870”When comparing the Radeon 7870 to the 7770, there is comparisson the 7870 is way better and the 7770 is not worth investing in.