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Radeon HD 3870 X2 512MB vs Radeon HD 6670 (OEM) 1GB
Intro
The Radeon HD 3870 X2 512MB features core clock speeds of 825 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 ROPs.Compare that to the Radeon HD 6670 (OEM) 1GB, which comes with core speeds of 800 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 480 SPUs as well as 24 Texture Address Units and 8 ROPs.
Power Usage and Theoretical Benchmarks
Memory Bandwidth
In theory, the Radeon HD 3870 X2 512MB is 80% faster than the Radeon HD 6670 (OEM) 1GB overall, because of its higher bandwidth. (explain)
| Radeon HD 3870 X2 512MB |
|
115200 MB/sec |
| Radeon HD 6670 (OEM) 1GB |
|
64000 MB/sec |
|
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Texel Rate
The Radeon HD 3870 X2 512MB will be quite a bit (more or less 38%) better at AF than the Radeon HD 6670 (OEM) 1GB. (explain)| Radeon HD 3870 X2 512MB |
|
26400 Mtexels/sec |
| Radeon HD 6670 (OEM) 1GB |
|
19200 Mtexels/sec |
|
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Pixel Rate
The Radeon HD 3870 X2 512MB should be quite a bit (about 313%) faster with regards to full screen anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and will be able to handle higher resolutions more effectively. (explain)| Radeon HD 3870 X2 512MB |
|
26400 Mpixels/sec |
| Radeon HD 6670 (OEM) 1GB |
|
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 512MBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 6670 (OEM) 1GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
|
Specifications
| Model | Radeon HD 3870 X2 512MB | Radeon HD 6670 (OEM) 1GB |
|---|---|---|
| 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 | 512 MB (x2) | 1024 MB |
| Core Speed | 825 MHz (x2) | 800 MHz |
| Shader Speed | N/A MHz (x2) | (N/A) MHz |
| Memory Speed | 900 MHz (x2) | 1000 MHz |
| Unified Shaders | 320(64x5) (x2) | 480 |
| Texture Mapping Units | 16 (x2) | 24 |
| Render Output Units | 16 (x2) | 8 |
| Bus Type | GDDR3 | 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 | 115200 MB/sec | 64000 MB/sec |
| Texel Rate | 26400 Mtexels/sec | 19200 Mtexels/sec |
| Pixel Rate | 26400 Mpixels/sec | 6400 Mpixels/sec |
Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at 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 that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.
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