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Radeon HD 4870 1GB vs Radeon HD 6850
Intro
The Radeon HD 4870 1GB comes with a core clock speed of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.Compare that to the Radeon HD 6850, which has core speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 960 SPUs as well as 48 TAUs 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
The Radeon HD 6850 should in theory perform a bit faster than the Radeon HD 4870 1GB in general. (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 should be much (approximately 24%) faster with regards to AF 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
The Radeon HD 6850 will be much (about 107%) better at FSAA than the Radeon HD 4870 1GB, and also should be able to handle higher resolutions more effectively. (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
Check prices at:
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Radeon HD 6850Amazon.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 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 (counted in megabytes per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.
Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units 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 many other factors, especially the memory bandwidth of the card - the lower the 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 [...]