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Radeon HD 4850 1GB vs Radeon HD 6770 1GB
Intro
The Radeon HD 4850 1GB has core speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR4 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.Compare all that to the Radeon HD 6770 1GB, which features GPU core speed of 900 MHz, and 1024 MB of GDDR5 RAM set to run at 1050 MHz through a 128-bit bus. It also features 800 Stream Processors, 40 TAUs, and 16 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6770 1GB |
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108 Watts |
| Radeon HD 4850 1GB |
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110 Watts |
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Memory Bandwidth
The Radeon HD 6770 1GB, in theory, should be a small bit faster than the Radeon HD 4850 1GB overall. (explain)
| Radeon HD 6770 1GB |
|
67200 MB/sec |
| Radeon HD 4850 1GB |
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63552 MB/sec |
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Texel Rate
The Radeon HD 6770 1GB is a lot (about 44%) more effective at texture filtering than the Radeon HD 4850 1GB. (explain)| Radeon HD 6770 1GB |
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36000 Mtexels/sec |
| Radeon HD 4850 1GB |
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25000 Mtexels/sec |
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Pixel Rate
The Radeon HD 6770 1GB will be a lot (about 44%) more effective at anti-aliasing than the Radeon HD 4850 1GB, and also should be able to handle higher resolutions better. (explain)| Radeon HD 6770 1GB |
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14400 Mpixels/sec |
| Radeon HD 4850 1GB |
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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 4850 1GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 6770 1GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | Radeon HD 4850 1GB | Radeon HD 6770 1GB |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | Jun 25, 2008 | January 2011 |
| Code Name | RV770 PRO | Juniper XT |
| Fab Process | 55 nm | 40 nm |
| Bus | PCIe 2.0 x16 | PCIe x16 |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 625 MHz | 900 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 993 MHz | 1050 MHz |
| Unified Shaders | 800(160x5) | 800 |
| Texture Mapping Units | 40 | 40 |
| Render Output Units | 16 | 16 |
| Bus Type | GDDR4 | GDDR5 |
| Bus Width | 256-bit | 128-bit |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.1 |
| Power (Max TDP) | 110 watts | 108 watts |
| Shader Model | 4.1 | 5.0 |
| Bandwidth | 63552 MB/sec | 67200 MB/sec |
| Texel Rate | 25000 Mtexels/sec | 36000 Mtexels/sec |
| Pixel Rate | 10000 Mpixels/sec | 14400 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the max amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many 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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