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Radeon HD 4850 X2 1GB vs Radeon HD 4850 X2 512MB
Intro
The Radeon HD 4850 X2 1GB comes with clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR3 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.Compare that to the Radeon HD 4850 X2 512MB, which comes with core speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 memory. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Both cards have the same power consumption.Memory Bandwidth
Both cards have exactly the same bandwidth, so in theory they should perform the same. (explain)
Texel Rate
Both cards have the exact same texel rate, so theoretically they should perform equally good at at AF. (explain)Pixel Rate
Both cards have the exact same pixel rate, so in theory they should perform equally good at at FSAA, and be able to handle the same screen resolutions. (explain)
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
Radeon HD 4850 X2 1GBAmazon.com
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Radeon HD 4850 X2 512MBAmazon.com
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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.
Specifications
| Model | Radeon HD 4850 X2 1GB | Radeon HD 4850 X2 512MB |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Nov 7, 2008 | Nov 7, 2008 |
| Code Name | R700 | R700 |
| Memory | 1024 MB (x2) | 512 MB (x2) |
| Core Speed | 625 MHz (x2) | 625 MHz (x2) |
| Memory Speed | 1986 MHz (x2) | 1986 MHz (x2) |
| Power (Max TDP) | 250 watts | 250 watts |
| Bandwidth | 127104 MB/sec | 127104 MB/sec |
| Texel Rate | 50000 Mtexels/sec | 50000 Mtexels/sec |
| Pixel Rate | 20000 Mpixels/sec | 20000 Mpixels/sec |
| Unified Shaders | 800(160x5) (x2) | 800(160x5) (x2) |
| Texture Mapping Units | 40 (x2) | 40 (x2) |
| Render Output Units | 16 (x2) | 16 (x2) |
| Bus Type | GDDR3 | GDDR3 |
| Bus Width | 256-bit (x2) | 256-bit (x2) |
| Fab Process | 55 nm | 55 nm |
| Transistors | 956 million | 956 million |
| Bus | PCIe 2.0 x16 (PCIe bridge) | PCIe 2.0 x16 (PCIe bridge) |
| DirectX Version | DirectX 10.1 | DirectX 10.1 |
| OpenGL Version | OpenGL 3.0 | OpenGL 3.0 |
Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 number of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 number of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.
Radeon HD 4850 X2 1GBAmazon.com
Check prices at:
|
Radeon HD 4850 X2 512MBAmazon.com
Check prices at:
|
Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.
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