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Radeon HD 4830 1GB vs Radeon HD 6770 1GB
Intro
The Radeon HD 4830 1GB uses a 55 nm design. ATi has clocked the core speed at 575 MHz. The GDDR4 RAM works at a frequency of 900 MHz on this specific card. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.Compare those specs to the Radeon HD 6770 1GB, which comes with core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4830 1GB |
|
95 Watts |
| Radeon HD 6770 1GB |
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108 Watts |
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Memory Bandwidth
In theory, the Radeon HD 6770 1GB is 17% quicker than the Radeon HD 4830 1GB overall, due to its higher bandwidth. (explain)
| Radeon HD 6770 1GB |
|
67200 MB/sec |
| Radeon HD 4830 1GB |
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57600 MB/sec |
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Texel Rate
The Radeon HD 6770 1GB should be quite a bit (approximately 96%) faster with regards to anisotropic filtering than the Radeon HD 4830 1GB. (explain)| Radeon HD 6770 1GB |
|
36000 Mtexels/sec |
| Radeon HD 4830 1GB |
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18400 Mtexels/sec |
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Pixel Rate
The Radeon HD 6770 1GB should be quite a bit (about 57%) more effective at full screen anti-aliasing than the Radeon HD 4830 1GB, and will be capable of handling higher resolutions better. (explain)| Radeon HD 6770 1GB |
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14400 Mpixels/sec |
| Radeon HD 4830 1GB |
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9200 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 4830 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 4830 1GB | Radeon HD 6770 1GB |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | Oct 21, 2008 | January 2011 |
| Code Name | RV770 LE | Juniper XT |
| Fab Process | 55 nm | 40 nm |
| Bus | PCIe 2.0 x16 | PCIe x16 |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 575 MHz | 900 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 900 MHz | 1050 MHz |
| Unified Shaders | 640(128x5) | 800 |
| Texture Mapping Units | 32 | 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) | 95 watts | 108 watts |
| Shader Model | 4.1 | 5.0 |
| Bandwidth | 57600 MB/sec | 67200 MB/sec |
| Texel Rate | 18400 Mtexels/sec | 36000 Mtexels/sec |
| Pixel Rate | 9200 Mpixels/sec | 14400 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.
Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on 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 get to the max fill rate.
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