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Radeon HD 5870 vs Radeon HD 7850
Intro
The Radeon HD 5870 has clock speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 memory. It features 1600(320x5) SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.Compare all of that to the Radeon HD 7850, which features GPU core speed of 860 MHz, and 2048 MB of GDDR5 RAM running at 1200 MHz through a 256-bit bus. It also is made up of 1024 SPUs, 64 Texture Address Units, and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7850 |
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130 Watts |
| Radeon HD 5870 |
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188 Watts |
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Memory Bandwidth
Both cards have the exact same bandwidth, so theoretically they should have identical performance. (explain)
Texel Rate
The Radeon HD 5870 should be much (approximately 24%) faster with regards to AF than the Radeon HD 7850. (explain)| Radeon HD 5870 |
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68000 Mtexels/sec |
| Radeon HD 7850 |
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55040 Mtexels/sec |
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Pixel Rate
The Radeon HD 7850 is a bit (more or less 1%) better at FSAA than the Radeon HD 5870, and will be able to handle higher screen resolutions without slowing down too much. (explain)| Radeon HD 7850 |
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27520 Mpixels/sec |
| Radeon HD 5870 |
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27200 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 5870
Radeon HD 7850
Specifications
| Model | Radeon HD 5870 | Radeon HD 7850 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | September 23, 2009 | March 2012 |
| Code Name | Cypress XT | Pitcairn Pro |
| Memory | 1024 MB | 2048 MB |
| Core Speed | 850 MHz | 860 MHz |
| Memory Speed | 4800 MHz | 4800 MHz |
| Power (Max TDP) | 188 watts | 130 watts |
| Bandwidth | 153600 MB/sec | 153600 MB/sec |
| Texel Rate | 68000 Mtexels/sec | 55040 Mtexels/sec |
| Pixel Rate | 27200 Mpixels/sec | 27520 Mpixels/sec |
| Unified Shaders | 1600(320x5) | 1024 |
| Texture Mapping Units | 80 | 64 |
| Render Output Units | 32 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit |
| Fab Process | 40 nm | 28 nm |
| Transistors | 2154 million | 2800 million |
| Bus | PCIe 2.1 x16 | PCIe 3.0 x16 |
| DirectX Version | DirectX 11 | DirectX 11.1 |
| OpenGL Version | OpenGL 3.2 | OpenGL 4.2 |
Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once 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 AA, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units of the card by the core 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 in one second.
Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.
Radeon HD 5870
Radeon HD 7850
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