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Radeon HD 4870 1GB vs Radeon HD 6850
Intro
The Radeon HD 4870 1GB makes use of a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 RAM is set to run at a frequency of 900 MHz on this particular card. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.Compare those specs to the Radeon HD 6850, which uses a 40 nm design. AMD has set the core speed at 775 MHz. The GDDR5 memory is set to run at a frequency of 1000 MHz on this specific card. It features 960 SPUs along with 48 Texture Address Units and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6850 |
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127 Watts |
| Radeon HD 4870 1GB |
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150 Watts |
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Memory Bandwidth
As far as performance goes, the Radeon HD 6850 should theoretically be a bit better than the Radeon HD 4870 1GB overall. (explain)
| Radeon HD 6850 |
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128000 MB/sec |
| Radeon HD 4870 1GB |
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115200 MB/sec |
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Texel Rate
The Radeon HD 6850 will be much (more or less 24%) better at texture filtering than the Radeon HD 4870 1GB. (explain)| Radeon HD 6850 |
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37200 Mtexels/sec |
| Radeon HD 4870 1GB |
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30000 Mtexels/sec |
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Pixel Rate
If running with lots of anti-aliasing is important to you, then the Radeon HD 6850 is superior to the Radeon HD 4870 1GB, by a large margin. (explain)| Radeon HD 6850 |
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24800 Mpixels/sec |
| Radeon HD 4870 1GB |
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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.
Price Comparison
Radeon HD 4870 1GBAmazon.com
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Radeon HD 6850Amazon.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 4870 1GB | Radeon HD 6850 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Jun 25, 2008 | October 2010 |
| Code Name | RV770 XT | Barts Pro |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 750 MHz | 775 MHz |
| Memory Speed | 3600 MHz | 4000 MHz |
| Power (Max TDP) | 150 watts | 127 watts |
| Bandwidth | 115200 MB/sec | 128000 MB/sec |
| Texel Rate | 30000 Mtexels/sec | 37200 Mtexels/sec |
| Pixel Rate | 12000 Mpixels/sec | 24800 Mpixels/sec |
| Unified Shaders | 800(160x5) | 960 |
| Texture Mapping Units | 40 | 48 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit |
| Fab Process | 55 nm | 40 nm |
| Transistors | 956 million | 1700 million |
| Bus | PCIe 2.0 x16 | PCIe x16 |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.1 |
Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics 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 number of pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output 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 reach the maximum fill rate.
Radeon HD 4870 1GBAmazon.com
Check prices at:
|
Radeon HD 6850Amazon.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.
|
Comments
One Response to “Radeon HD 4870 1GB vs Radeon HD 6850”[...] zu einer Karte aus dem Performancesegment wie die HD6850/6870 sieht es schon ganz anders aus (siehe hier). Preis liegt bei ca. 130 Euro für eine 6850. Die Leistungsaufnahme dieser Karten ist ebenfalls [...]