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Radeon HD 3850 256MB vs Radeon HD 3850 512MB
Intro
The Radeon HD 3850 256MB features a clock frequency of 668 MHz and a GDDR3 memory speed of 828 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.Compare all of that to the Radeon HD 3850 512MB, which makes use of a 55 nm design. AMD has set the core speed at 668 MHz. The GDDR3 RAM runs at a speed of 828 MHz on this particular model. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 ROPs.
Power Usage and Theoretical Benchmarks
Both cards have the same power consumption.Memory Bandwidth
Both cards have exactly the same memory bandwidth, so theoretically they should have the same performance. (explain)
Texel Rate
Both cards have the exact same texel fill rate, so in theory they should be equally good at at anisotropic filtering. (explain)Pixel Rate
Both cards have exactly the same pixel rate, so in theory they should perform equally good at at FSAA, and be capable of handling the same 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 information (measured in MB per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units of the card by the core 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 processed in a second.
Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. 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 rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach 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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