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Radeon HD 4870 512MB vs Radeon HD 4870 X2
Intro
The Radeon HD 4870 512MB comes with clock speeds of 750 MHz on the GPU, and 900 MHz on the 512 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.Compare those specifications to the Radeon HD 4870 X2, which comes with core speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.
Battlefield Bad Company 2
| Settings: | High Quality |
| AA: | 4x |
| AF: | 8x |
| Resolution: | 1920x1200 |
| Test Machine: | Tom's Hardware Test Machine (Source) |
| Radeon HD 4870 X2 |
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60 FPS |
| Radeon HD 4870 512MB |
|
20 FPS |
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Left4Dead 2
| Settings: | Very High |
| AA: | 8x |
| AF: | 16x |
| Resolution: | 1920x1200 |
| Test Machine: | Tom's Hardware Test Machine (Source) |
| Radeon HD 4870 X2 |
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134 FPS |
| Radeon HD 4870 512MB |
|
77 FPS |
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Supreme Commander 2
| Settings: | High |
| AA: | 8x |
| AF: | 16x |
| Resolution: | 1920x1200 |
| Test Machine: | Tom's Hardware Test Machine (Source) |
| Radeon HD 4870 X2 |
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99 FPS |
| Radeon HD 4870 512MB |
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55 FPS |
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Radeon HD 4870 X2 wins
(Based entirely on the benchmarks listed above)
When combining all game benchmark scores on this page together, the Radeon HD 4870 X2 wins overall, by 141 FPS. Please note that we do not have the results of every benchmark ever done for these cards, so the results may differ wildly in different games.
| Radeon HD 4870 X2 |
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293 FPS |
| Radeon HD 4870 512MB |
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152 FPS |
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Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4870 512MB |
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150 Watts |
| Radeon HD 4870 X2 |
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350 Watts |
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Memory Bandwidth
Performance-wise, the Radeon HD 4870 X2 should theoretically be much superior to the Radeon HD 4870 512MB in general. (explain)
| Radeon HD 4870 X2 |
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230400 MB/sec |
| Radeon HD 4870 512MB |
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115200 MB/sec |
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Texel Rate
The Radeon HD 4870 X2 is quite a bit (approximately 100%) more effective at texture filtering than the Radeon HD 4870 512MB. (explain)| Radeon HD 4870 X2 |
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60000 Mtexels/sec |
| Radeon HD 4870 512MB |
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30000 Mtexels/sec |
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Pixel Rate
If using a high screen resolution is important to you, then the Radeon HD 4870 X2 is a better choice, and very much so. (explain)| Radeon HD 4870 X2 |
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24000 Mpixels/sec |
| Radeon HD 4870 512MB |
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12000 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.
One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.
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 4870 512MBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 4870 X2Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | Radeon HD 4870 512MB | Radeon HD 4870 X2 |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | Jun 25, 2008 | Aug 12, 2008 |
| Code Name | RV770 XT | R700 |
| Fab Process | 55 nm | 55 nm |
| Bus | PCIe 2.0 x16 | PCIe 2.0 x16 (PCIe bridge) |
| Memory | 512 MB | 1024 MB (x2) |
| Core Speed | 750 MHz | 750 MHz (x2) |
| Shader Speed | N/A MHz | (N/A) MHz (x2) |
| Memory Speed | 900 MHz | 900 MHz (x2) |
| Unified Shaders | 800(160x5) | 800(160x5) (x2) |
| Texture Mapping Units | 40 | 40 (x2) |
| Render Output Units | 16 | 16 (x2) |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit (x2) |
| DirectX Version | DirectX 10.1 | DirectX 10.1 |
| OpenGL Version | OpenGL 3.0 | OpenGL 3.0 |
| Power (Max TDP) | 150 watts | 350 watts |
| Shader Model | 4.1 | 4.1 |
| Bandwidth | 115200 MB/sec | 230400 MB/sec |
| Texel Rate | 30000 Mtexels/sec | 60000 Mtexels/sec |
| Pixel Rate | 12000 Mpixels/sec | 24000 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.
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