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Radeon HD 3870 512MB vs Radeon HD 6670 (OEM) 1GB
Intro
The Radeon HD 3870 512MB features a GPU clock speed of 775 MHz, and the 512 MB of GDDR3 memory runs at 900 MHz through a 256-bit bus. It also is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.Compare all of that to the Radeon HD 6670 (OEM) 1GB, which has a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also features 480 SPUs, 24 TAUs, and 8 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6670 (OEM) 1GB |
|
63 Watts |
| Radeon HD 3870 512MB |
|
106 Watts |
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Memory Bandwidth
Theoretically, the Radeon HD 6670 (OEM) 1GB should perform just a bit faster than the Radeon HD 3870 512MB overall. (explain)
| Radeon HD 6670 (OEM) 1GB |
|
64000 MB/sec |
| Radeon HD 3870 512MB |
|
57600 MB/sec |
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Texel Rate
The Radeon HD 6670 (OEM) 1GB should be much (approximately 55%) better at AF than the Radeon HD 3870 512MB. (explain)| Radeon HD 6670 (OEM) 1GB |
|
19200 Mtexels/sec |
| Radeon HD 3870 512MB |
|
12400 Mtexels/sec |
|
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Pixel Rate
If running with a high screen resolution is important to you, then the Radeon HD 3870 512MB is superior to the Radeon HD 6670 (OEM) 1GB, and very much so. (explain)| Radeon HD 3870 512MB |
|
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 512MBAmazon.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 512MB | 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 | 512 MB | 1024 MB |
| Core Speed | 775 MHz | 800 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 900 MHz | 1000 MHz |
| Unified Shaders | 320(64x5) | 480 |
| Texture Mapping Units | 16 | 24 |
| Render Output Units | 16 | 8 |
| Bus Type | GDDR3 | 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 | 57600 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 max amount of information (measured in megabytes per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied 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 the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.
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