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Radeon HD 3850 1GB vs Radeon HD 4850 2GB
Intro
The Radeon HD 3850 1GB uses a 55 nm design. ATi has set the core speed at 668 MHz. The GDDR3 memory works at a frequency of 828 MHz on this specific card. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.Compare that to the Radeon HD 4850 2GB, which has core speeds of 625 MHz on the GPU, and 993 MHz on the 2048 MB of GDDR4 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 3850 1GB |
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75 Watts |
| Radeon HD 4850 2GB |
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110 Watts |
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Memory Bandwidth
Theoretically speaking, the Radeon HD 4850 2GB is 20% faster than the Radeon HD 3850 1GB in general, due to its greater bandwidth. (explain)
| Radeon HD 4850 2GB |
|
63552 MB/sec |
| Radeon HD 3850 1GB |
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52992 MB/sec |
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Texel Rate
The Radeon HD 4850 2GB should be much (approximately 134%) more effective at texture filtering than the Radeon HD 3850 1GB. (explain)| Radeon HD 4850 2GB |
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25000 Mtexels/sec |
| Radeon HD 3850 1GB |
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10688 Mtexels/sec |
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Pixel Rate
The Radeon HD 3850 1GB will be a bit (about 7%) better at AA than the Radeon HD 4850 2GB, and also will be able to handle higher screen resolutions without losing too much performance. (explain)| Radeon HD 3850 1GB |
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10688 Mpixels/sec |
| Radeon HD 4850 2GB |
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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.
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 3850 1GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 4850 2GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | Radeon HD 3850 1GB | Radeon HD 4850 2GB |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | Nov 19, 2007 | Jun 25, 2008 |
| Code Name | RV670 PRO | RV770 PRO |
| Fab Process | 55 nm | 55 nm |
| Bus | PCIe 2.0 x16/AGP 8x | PCIe 2.0 x16 |
| Memory | 1024 MB | 2048 MB |
| Core Speed | 668 MHz | 625 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 828 MHz | 993 MHz |
| Unified Shaders | 320(64x5) | 800(160x5) |
| Texture Mapping Units | 16 | 40 |
| Render Output Units | 16 | 16 |
| Bus Type | GDDR3 | GDDR4 |
| Bus Width | 256-bit | 256-bit |
| DirectX Version | DirectX 10.1 | DirectX 10.1 |
| OpenGL Version | OpenGL 3.0 | OpenGL 3.0 |
| Power (Max TDP) | 75 watts | 110 watts |
| Shader Model | 4.1 | 4.1 |
| Bandwidth | 52992 MB/sec | 63552 MB/sec |
| Texel Rate | 10688 Mtexels/sec | 25000 Mtexels/sec |
| Pixel Rate | 10688 Mpixels/sec | 10000 Mpixels/sec |
Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is worked out 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.
Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.
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