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Radeon HD 4850 512MB vs Radeon HD 4850 X2 512MB
Intro
The Radeon HD 4850 512MB comes with a core clock speed of 625 MHz and a GDDR3 memory frequency of 993 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.Compare those specifications to the Radeon HD 4850 X2 512MB, which has core clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4850 512MB |
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110 Watts |
| Radeon HD 4850 X2 512MB |
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250 Watts |
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Memory Bandwidth
Theoretically, the Radeon HD 4850 X2 512MB should perform quite a bit faster than the Radeon HD 4850 512MB in general. (explain)
| Radeon HD 4850 X2 512MB |
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127104 MB/sec |
| Radeon HD 4850 512MB |
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63552 MB/sec |
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Texel Rate
The Radeon HD 4850 X2 512MB is quite a bit (approximately 100%) more effective at texture filtering than the Radeon HD 4850 512MB. (explain)| Radeon HD 4850 X2 512MB |
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50000 Mtexels/sec |
| Radeon HD 4850 512MB |
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25000 Mtexels/sec |
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Pixel Rate
The Radeon HD 4850 X2 512MB should be much (approximately 100%) more effective at AA than the Radeon HD 4850 512MB, and also should be capable of handling higher resolutions without slowing down too much. (explain)| Radeon HD 4850 X2 512MB |
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20000 Mpixels/sec |
| Radeon HD 4850 512MB |
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10000 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 512MBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 4850 X2 512MBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
|
Specifications
| Model | Radeon HD 4850 512MB | Radeon HD 4850 X2 512MB |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | Jun 25, 2008 | Nov 7, 2008 |
| Code Name | RV770 PRO | R700 |
| Fab Process | 55 nm | 55 nm |
| Bus | PCIe 2.0 x16 | PCIe 2.0 x16 (PCIe bridge) |
| Memory | 512 MB | 512 MB (x2) |
| Core Speed | 625 MHz | 625 MHz (x2) |
| Shader Speed | N/A MHz | (N/A) MHz (x2) |
| Memory Speed | 993 MHz | 993 MHz (x2) |
| Unified Shaders | 800(160x5) | 800(160x5) (x2) |
| Texture Mapping Units | 40 | 40 (x2) |
| Render Output Units | 16 | 16 (x2) |
| Bus Type | GDDR3 | GDDR3 |
| Bus Width | 256-bit | 256-bit (x2) |
| DirectX Version | DirectX 10.1 | DirectX 10.1 |
| OpenGL Version | OpenGL 3.0 | OpenGL 3.0 |
| Power (Max TDP) | 110 watts | 250 watts |
| Shader Model | 4.1 | 4.1 |
| Bandwidth | 63552 MB/sec | 127104 MB/sec |
| Texel Rate | 25000 Mtexels/sec | 50000 Mtexels/sec |
| Pixel Rate | 10000 Mpixels/sec | 20000 Mpixels/sec |
Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out 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 card will be at 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 record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka 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 maximum fill rate.
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