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Radeon HD 3870 1GB vs Radeon HD 6670 (OEM) 1GB
Intro
The Radeon HD 3870 1GB features a GPU core clock speed of 775 MHz, and the 1024 MB of GDDR4 RAM runs at 1125 MHz through a 256-bit bus. It also features 320(64x5) Stream Processors, 16 Texture Address Units, and 16 ROPs.Compare those specs to the Radeon HD 6670 (OEM) 1GB, which has a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 128-bit bus. It also is made up of 480 SPUs, 24 TAUs, and 8 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6670 (OEM) 1GB |
|
63 Watts |
| Radeon HD 3870 1GB |
|
106 Watts |
|
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Memory Bandwidth
The Radeon HD 3870 1GB should in theory be a bit faster than the Radeon HD 6670 (OEM) 1GB overall. (explain)
| Radeon HD 3870 1GB |
|
72000 MB/sec |
| Radeon HD 6670 (OEM) 1GB |
|
64000 MB/sec |
|
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Texel Rate
The Radeon HD 6670 (OEM) 1GB should be quite a bit (approximately 55%) faster with regards to anisotropic filtering than the Radeon HD 3870 1GB. (explain)| Radeon HD 6670 (OEM) 1GB |
|
19200 Mtexels/sec |
| Radeon HD 3870 1GB |
|
12400 Mtexels/sec |
|
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Pixel Rate
If running with a high resolution is important to you, then the Radeon HD 3870 1GB is a better choice, by far. (explain)| Radeon HD 3870 1GB |
|
12400 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.
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 1GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
|
Radeon HD 6670 (OEM) 1GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
|
Specifications
| Model | Radeon HD 3870 1GB | Radeon HD 6670 (OEM) 1GB |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | Nov 19, 2007 | February 2011 |
| Code Name | RV670 XT | Turks |
| Fab Process | 55 nm | 40 nm |
| Bus | PCIe 2.0 x16/AGP 8x | PCIe 2.1 x16 |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 775 MHz | 800 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 1125 MHz | 1000 MHz |
| Unified Shaders | 320(64x5) | 480 |
| Texture Mapping Units | 16 | 24 |
| Render Output Units | 16 | 8 |
| Bus Type | GDDR4 | GDDR5 |
| Bus Width | 256-bit | 128-bit |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.1 |
| Power (Max TDP) | 106 watts | 63 watts |
| Shader Model | 4.1 | 5.0 |
| Bandwidth | 72000 MB/sec | 64000 MB/sec |
| Texel Rate | 12400 Mtexels/sec | 19200 Mtexels/sec |
| Pixel Rate | 12400 Mpixels/sec | 6400 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.
Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. 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, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.
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