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Radeon HD 5770 vs Radeon HD 7850
Intro
The Radeon HD 5770 comes with clock speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.Compare those specs to the Radeon HD 7850, which has a GPU core clock speed of 860 MHz, and 2048 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also is made up of 1024 Stream Processors, 64 Texture Address Units, and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 5770 |
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108 Watts |
| Radeon HD 7850 |
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130 Watts |
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Memory Bandwidth
As far as performance goes, the Radeon HD 7850 should theoretically be much better than the Radeon HD 5770 overall. (explain)
| Radeon HD 7850 |
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153600 MB/sec |
| Radeon HD 5770 |
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76800 MB/sec |
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Texel Rate
The Radeon HD 7850 is a lot (about 62%) more effective at AF than the Radeon HD 5770. (explain)| Radeon HD 7850 |
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55040 Mtexels/sec |
| Radeon HD 5770 |
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34000 Mtexels/sec |
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Pixel Rate
If running with a high screen resolution is important to you, then the Radeon HD 7850 is superior to the Radeon HD 5770, by far. (explain)| Radeon HD 7850 |
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27520 Mpixels/sec |
| Radeon HD 5770 |
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13600 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 5770Amazon.com
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Radeon HD 7850Amazon.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 5770 | Radeon HD 7850 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | October 13, 2009 | March 2012 |
| Code Name | Juniper XT | Pitcairn Pro |
| Fab Process | 40 nm | 28 nm |
| Bus | PCIe 2.1 x16 | PCIe 3.0 x16 |
| Memory | 1024 MB | 2048 MB |
| Core Speed | 850 MHz | 860 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 1200 MHz (4800 MHz effective) | 1200 MHz (4800 MHz effective) |
| Unified Shaders | 800(160x5) | 1024 |
| Texture Mapping Units | 40 | 64 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 128-bit | 256-bit |
| DirectX Version | DirectX 11 | DirectX 11.1 |
| OpenGL Version | OpenGL 3.2 | OpenGL 4.2 |
| Power (Max TDP) | 108 watts | 130 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 76800 MB/sec | 153600 MB/sec |
| Texel Rate | 34000 Mtexels/sec | 55040 Mtexels/sec |
| Pixel Rate | 13600 Mpixels/sec | 27520 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 amount of texture map elements (texels) that are 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 better this number, the better the video 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 maximum amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.
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