 |
 |
|
|
|
Radeon HD 3870 X2 1GB vs Radeon HD 6670 (OEM) 1GB
Intro
The Radeon HD 3870 X2 1GB has a core clock frequency of 825 MHz and a GDDR4 memory frequency of 1126 MHz. It also features a 256-bit bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.Compare those specs to the Radeon HD 6670 (OEM) 1GB, which has a clock speed of 800 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It features 480 SPUs, 24 TAUs, and 8 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Memory Bandwidth
The Radeon HD 3870 X2 1GB, in theory, should perform quite a bit faster than the Radeon HD 6670 (OEM) 1GB in general. (explain)
| Radeon HD 3870 X2 1GB |
|
144128 MB/sec |
| Radeon HD 6670 (OEM) 1GB |
|
64000 MB/sec |
|
|
Texel Rate
The Radeon HD 3870 X2 1GB will be a lot (approximately 38%) faster with regards to anisotropic filtering than the Radeon HD 6670 (OEM) 1GB. (explain)| Radeon HD 3870 X2 1GB |
|
26400 Mtexels/sec |
| Radeon HD 6670 (OEM) 1GB |
|
19200 Mtexels/sec |
|
|
Pixel Rate
If running with lots of anti-aliasing is important to you, then the Radeon HD 3870 X2 1GB is superior to the Radeon HD 6670 (OEM) 1GB, by a large margin. (explain)| Radeon HD 3870 X2 1GB |
|
26400 Mpixels/sec |
| Radeon HD 6670 (OEM) 1GB |
|
6400 Mpixels/sec |
|
|
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
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 X2 1GB | 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 | 1024 MB (x2) | 1024 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: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher 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 texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of 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 is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.
Comments
Be the first to leave a comment!