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Radeon HD 4850 X2 1GB vs Radeon HD 6670 (OEM)
Intro
The Radeon HD 4850 X2 1GB uses a 55 nm design. ATi has clocked the core frequency at 625 MHz. The GDDR3 RAM runs at a speed of 993 MHz on this specific model. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.Compare those specs to the Radeon HD 6670 (OEM), which features a clock speed of 800 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is made up of 480 SPUs, 24 TAUs, and 8 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6670 (OEM) |
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63 Watts |
| Radeon HD 4850 X2 1GB |
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250 Watts |
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Memory Bandwidth
Theoretically speaking, the Radeon HD 4850 X2 1GB should be 99% quicker than the Radeon HD 6670 (OEM) overall, due to its higher bandwidth. (explain)
| Radeon HD 4850 X2 1GB |
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127104 MB/sec |
| Radeon HD 6670 (OEM) |
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64000 MB/sec |
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Texel Rate
The Radeon HD 4850 X2 1GB is a lot (about 160%) faster with regards to texture filtering than the Radeon HD 6670 (OEM). (explain)| Radeon HD 4850 X2 1GB |
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50000 Mtexels/sec |
| Radeon HD 6670 (OEM) |
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19200 Mtexels/sec |
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Pixel Rate
The Radeon HD 4850 X2 1GB will be much (more or less 213%) better at anti-aliasing than the Radeon HD 6670 (OEM), and also should be able to handle higher screen resolutions without losing too much performance. (explain)| Radeon HD 4850 X2 1GB |
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20000 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 4850 X2 1GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
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 4850 X2 1GB | Radeon HD 6670 (OEM) |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | Nov 7, 2008 | February 2011 |
| Code Name | R700 | Turks |
| Fab Process | 55 nm | 40 nm |
| Bus | PCIe 2.0 x16 (PCIe bridge) | PCIe 2.1 x16 |
| Memory | 1024 MB (x2) | 512 MB |
| Core Speed | 625 MHz (x2) | 800 MHz |
| Shader Speed | N/A MHz (x2) | (N/A) MHz |
| Memory Speed | 993 MHz (x2) | 1000 MHz |
| Unified Shaders | 800(160x5) (x2) | 480 |
| Texture Mapping Units | 40 (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) | 250 watts | 63 watts |
| Shader Model | 4.1 | 5.0 |
| Bandwidth | 127104 MB/sec | 64000 MB/sec |
| Texel Rate | 50000 Mtexels/sec | 19200 Mtexels/sec |
| Pixel Rate | 20000 Mpixels/sec | 6400 Mpixels/sec |
Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). 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 ability to reach the maximum fill rate.
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