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Radeon HD 3870 X2 1GB vs Radeon HD 6670 (OEM)
Intro
The Radeon HD 3870 X2 1GB comes with a GPU clock speed of 825 MHz, and the 1024 MB of GDDR4 RAM is set to run at 1126 MHz through a 256-bit bus. It also is comprised of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.Compare those specs to the Radeon HD 6670 (OEM), which has a GPU core clock speed of 800 MHz, and 512 MB of GDDR5 memory running at 1000 MHz through a 128-bit bus. It also features 480 Stream Processors, 24 TAUs, and 8 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Memory Bandwidth
Theoretically speaking, the Radeon HD 3870 X2 1GB is 125% faster than the Radeon HD 6670 (OEM) in general, due to its greater data rate. (explain)
| Radeon HD 3870 X2 1GB |
|
144128 MB/sec |
| Radeon HD 6670 (OEM) |
|
64000 MB/sec |
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Texel Rate
The Radeon HD 3870 X2 1GB will be quite a bit (approximately 38%) better at AF than the Radeon HD 6670 (OEM). (explain)| Radeon HD 3870 X2 1GB |
|
26400 Mtexels/sec |
| Radeon HD 6670 (OEM) |
|
19200 Mtexels/sec |
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Pixel Rate
The Radeon HD 3870 X2 1GB is much (more or less 313%) better at full screen anti-aliasing than the Radeon HD 6670 (OEM), and also will be able to handle higher screen resolutions without losing too much performance. (explain)| Radeon HD 3870 X2 1GB |
|
26400 Mpixels/sec |
| Radeon HD 6670 (OEM) |
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6400 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 3870 X2 1GBAmazon.com
Other US-based stores
Amazon.co.uk
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Amazon.fr
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Radeon HD 6670 (OEM)Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | Radeon HD 3870 X2 1GB | Radeon HD 6670 (OEM) |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | Jan 28, 2008 | February 2011 |
| Code Name | R680 | Turks |
| Fab Process | 55 nm | 40 nm |
| Bus | PCIe 2.0 x16/(internal PCIe 1.1 x16) | PCIe 2.1 x16 |
| Memory | 1024 MB (x2) | 512 MB |
| Core Speed | 825 MHz (x2) | 800 MHz |
| Shader Speed | N/A MHz (x2) | (N/A) MHz |
| Memory Speed | 1126 MHz (x2) | 1000 MHz |
| Unified Shaders | 320(64x5) (x2) | 480 |
| Texture Mapping Units | 16 (x2) | 24 |
| Render Output Units | 16 (x2) | 8 |
| Bus Type | GDDR4 | GDDR5 |
| Bus Width | 256-bit (x2) | 128-bit |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.1 |
| Power (Max TDP) | N/A watts | 63 watts |
| Shader Model | 4.1 | 5.0 |
| Bandwidth | 144128 MB/sec | 64000 MB/sec |
| Texel Rate | 26400 Mtexels/sec | 19200 Mtexels/sec |
| Pixel Rate | 26400 Mpixels/sec | 6400 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the 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 most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.
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