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Radeon HD 3850 256MB vs Radeon HD 3850 512MB
Intro
The Radeon HD 3850 256MB uses a 55 nm design. AMD has set the core speed at 668 MHz. The GDDR3 RAM runs at a frequency of 828 MHz on this card. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.Compare those specs to the Radeon HD 3850 512MB, which comes with a clock speed of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Both cards have the same power consumption.Memory Bandwidth
Both cards have the exact same memory bandwidth, so theoretically they should perform the same. (explain)
Texel Rate
Both cards have exactly the same texel fill rate, so theoretically they should be equally good at at AF. (explain)Pixel Rate
Both cards have exactly the same pixel fill rate, so in theory they should perform equally good at at AA, 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.
Price Comparison
Radeon HD 3850 256MBAmazon.com
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Radeon HD 3850 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 3850 256MB | Radeon HD 3850 512MB |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Nov 19, 2007 | Nov 19, 2007 |
| Code Name | RV670 PRO | RV670 PRO |
| Memory | 256 MB | 512 MB |
| Core Speed | 668 MHz | 668 MHz |
| Memory Speed | 1656 MHz | 1656 MHz |
| Power (Max TDP) | 75 watts | 75 watts |
| Bandwidth | 52992 MB/sec | 52992 MB/sec |
| Texel Rate | 10688 Mtexels/sec | 10688 Mtexels/sec |
| Pixel Rate | 10688 Mpixels/sec | 10688 Mpixels/sec |
| Unified Shaders | 320(64x5) | 320(64x5) |
| Texture Mapping Units | 16 | 16 |
| Render Output Units | 16 | 16 |
| Bus Type | GDDR3 | GDDR3 |
| Bus Width | 256-bit | 256-bit |
| Fab Process | 55 nm | 55 nm |
| Transistors | (Unknown) million | (Unknown) million |
| Bus | PCIe 2.0 x16/AGP 8x | PCIe 2.0 x16/AGP 8x |
| DirectX Version | DirectX 10.1 | DirectX 10.1 |
| OpenGL Version | OpenGL 3.0 | OpenGL 3.0 |
Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, 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 card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.
Radeon HD 3850 256MBAmazon.com
Check prices at:
|
Radeon HD 3850 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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