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Radeon HD 4850 X2 512MB vs Radeon HD 6870
Intro
The Radeon HD 4850 X2 512MB makes use of a 55 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR3 RAM runs at a speed of 993 MHz on this specific model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.Compare those specifications to the Radeon HD 6870, which has core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 1120 SPUs as well as 56 TAUs and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6870 |
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151 Watts |
| Radeon HD 4850 X2 512MB |
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250 Watts |
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Memory Bandwidth
The Radeon HD 6870, in theory, should be just a bit faster than the Radeon HD 4850 X2 512MB in general. (explain)
| Radeon HD 6870 |
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134400 MB/sec |
| Radeon HD 4850 X2 512MB |
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127104 MB/sec |
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Texel Rate
The Radeon HD 6870 should be a little bit (more or less 1%) faster with regards to texture filtering than the Radeon HD 4850 X2 512MB. (explain)| Radeon HD 6870 |
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50400 Mtexels/sec |
| Radeon HD 4850 X2 512MB |
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50000 Mtexels/sec |
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Pixel Rate
If running with high levels of AA is important to you, then the Radeon HD 6870 is superior to the Radeon HD 4850 X2 512MB, by a large margin. (explain)| Radeon HD 6870 |
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28800 Mpixels/sec |
| Radeon HD 4850 X2 512MB |
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20000 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
Radeon HD 4850 X2 512MBAmazon.com
Check prices at:
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Radeon HD 6870Amazon.com
Check prices at:
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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 4850 X2 512MB | Radeon HD 6870 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Nov 7, 2008 | October 2010 |
| Code Name | R700 | Barts XT |
| Memory | 512 MB (x2) | 1024 MB |
| Core Speed | 625 MHz (x2) | 900 MHz |
| Memory Speed | 1986 MHz (x2) | 4200 MHz |
| Power (Max TDP) | 250 watts | 151 watts |
| Bandwidth | 127104 MB/sec | 134400 MB/sec |
| Texel Rate | 50000 Mtexels/sec | 50400 Mtexels/sec |
| Pixel Rate | 20000 Mpixels/sec | 28800 Mpixels/sec |
| Unified Shaders | 800(160x5) (x2) | 1120 |
| Texture Mapping Units | 40 (x2) | 56 |
| Render Output Units | 16 (x2) | 32 |
| Bus Type | GDDR3 | GDDR5 |
| Bus Width | 256-bit (x2) | 256-bit |
| Fab Process | 55 nm | 40 nm |
| Transistors | 956 million | 1700 million |
| Bus | PCIe 2.0 x16 (PCIe bridge) | PCIe x16 |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.1 |
Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total texture units by the core clock 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 processed in one second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.
Radeon HD 4850 X2 512MBAmazon.com
Check prices at:
|
Radeon HD 6870Amazon.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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