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Radeon HD 4870 1GB vs Radeon HD 6870
Intro
The Radeon HD 4870 1GB uses a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 RAM works at a frequency of 900 MHz on this particular model. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.Compare that to the Radeon HD 6870, which makes use of a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM works at a frequency of 1050 MHz on this model. It features 1120 SPUs as well as 56 Texture Address Units and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4870 1GB |
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150 Watts |
| Radeon HD 6870 |
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151 Watts |
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Memory Bandwidth
In theory, the Radeon HD 6870 will be 17% quicker than the Radeon HD 4870 1GB overall, due to its greater bandwidth. (explain)
| Radeon HD 6870 |
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134400 MB/sec |
| Radeon HD 4870 1GB |
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115200 MB/sec |
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Texel Rate
The Radeon HD 6870 should be much (more or less 68%) faster with regards to anisotropic filtering than the Radeon HD 4870 1GB. (explain)| Radeon HD 6870 |
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50400 Mtexels/sec |
| Radeon HD 4870 1GB |
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30000 Mtexels/sec |
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Pixel Rate
If running with a high screen resolution is important to you, then the Radeon HD 6870 is superior to the Radeon HD 4870 1GB, by a large margin. (explain)| Radeon HD 6870 |
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28800 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 6870Amazon.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 6870 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Jun 25, 2008 | October 2010 |
| Code Name | RV770 XT | Barts XT |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 750 MHz | 900 MHz |
| Memory Speed | 3600 MHz | 4200 MHz |
| Power (Max TDP) | 150 watts | 151 watts |
| Bandwidth | 115200 MB/sec | 134400 MB/sec |
| Texel Rate | 30000 Mtexels/sec | 50400 Mtexels/sec |
| Pixel Rate | 12000 Mpixels/sec | 28800 Mpixels/sec |
| Unified Shaders | 800(160x5) | 1120 |
| Texture Mapping Units | 40 | 56 |
| 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: Bandwidth is the largest amount of data (in units of MB per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.
Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in a 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 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 get to the max fill rate.
Radeon HD 4870 1GBAmazon.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.
|
Comments
One Response to “Radeon HD 4870 1GB vs Radeon HD 6870”[...] Einiges an Hardware... nachfolger sind in der regel immer besser Radeon HD 4870 1GB vs Radeon HD 6870 – Performance Comparison Benchmarks @ Hardware Compare dadazu kommt noch das die 6870 nicht nur schneller sondern auch mehr futures hat DirectX11 usw. [...]