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Radeon HD 5870 vs Radeon HD 7970
Intro
The Radeon HD 5870 has a GPU core speed of 850 MHz, and the 1024 MB of GDDR5 memory runs at 1200 MHz through a 256-bit bus. It also features 1600(320x5) SPUs, 80 Texture Address Units, and 32 ROPs.Compare those specifications to the Radeon HD 7970, which has a clock speed of 925 MHz and a GDDR5 memory frequency of 1375 MHz. It also uses a 384-bit memory bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 5870 |
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188 Watts |
| Radeon HD 7970 |
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250 Watts |
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Memory Bandwidth
As far as performance goes, the Radeon HD 7970 should in theory be quite a bit superior to the Radeon HD 5870 overall. (explain)
| Radeon HD 7970 |
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264000 MB/sec |
| Radeon HD 5870 |
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153600 MB/sec |
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Texel Rate
The Radeon HD 7970 will be quite a bit (approximately 74%) better at texture filtering than the Radeon HD 5870. (explain)| Radeon HD 7970 |
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118400 Mtexels/sec |
| Radeon HD 5870 |
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68000 Mtexels/sec |
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Pixel Rate
The Radeon HD 7970 is just a bit (approximately 9%) more effective at anti-aliasing than the Radeon HD 5870, and also should be capable of handling higher resolutions while still performing well. (explain)| Radeon HD 7970 |
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29600 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
Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.
Radeon HD 5870Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 7970Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | Radeon HD 5870 | Radeon HD 7970 |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | September 23, 2009 | January 2012 |
| Code Name | Cypress XT | Tahiti XT |
| Fab Process | 40 nm | 28 nm |
| Bus | PCIe 2.1 x16 | PCIe 3.0 x16 |
| Memory | 1024 MB | 3072 MB |
| Core Speed | 850 MHz | 925 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 1200 MHz (4800 MHz effective) | 1375 MHz (5500 MHz effective) |
| Unified Shaders | 1600(320x5) | 2048 |
| Texture Mapping Units | 80 | 128 |
| Render Output Units | 32 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 384-bit |
| DirectX Version | DirectX 11 | DirectX 11.1 |
| OpenGL Version | OpenGL 3.2 | OpenGL 4.2 |
| Power (Max TDP) | 188 watts | 250 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 153600 MB/sec | 264000 MB/sec |
| Texel Rate | 68000 Mtexels/sec | 118400 Mtexels/sec |
| Pixel Rate | 27200 Mpixels/sec | 29600 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB 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 it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is calculated 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.
Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.
Comments
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