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Radeon HD 6770 1GB vs Radeon HD 6790
Intro
The Radeon HD 6770 1GB uses a 40 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 memory works at a frequency of 1050 MHz on this specific card. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.Compare that to the Radeon HD 6790, which features GPU clock speed of 840 MHz, and 1024 MB of GDDR5 RAM running at 1050 MHz through a 256-bit bus. It also features 800 SPUs, 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 6790 |
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150 Watts |
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Memory Bandwidth
Performance-wise, the Radeon HD 6790 should in theory be a lot better than the Radeon HD 6770 1GB overall. (explain)
| Radeon HD 6790 |
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134400 MB/sec |
| Radeon HD 6770 1GB |
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67200 MB/sec |
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Texel Rate
The Radeon HD 6770 1GB will be a little bit (approximately 7%) better at AF than the Radeon HD 6790. (explain)| Radeon HD 6770 1GB |
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36000 Mtexels/sec |
| Radeon HD 6790 |
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33600 Mtexels/sec |
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Pixel Rate
The Radeon HD 6770 1GB is a bit (approximately 7%) faster with regards to full screen anti-aliasing than the Radeon HD 6790, and also should be able to handle higher resolutions without losing too much performance. (explain)| Radeon HD 6770 1GB |
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14400 Mpixels/sec |
| Radeon HD 6790 |
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13440 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
Radeon HD 6770 1GBAmazon.com
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Radeon HD 6790Amazon.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 6770 1GB | Radeon HD 6790 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | January 2011 | April 2011 |
| Code Name | Juniper XT | Barts LE |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 900 MHz | 840 MHz |
| Memory Speed | 4200 MHz | 4200 MHz |
| Power (Max TDP) | 108 watts | 150 watts |
| Bandwidth | 67200 MB/sec | 134400 MB/sec |
| Texel Rate | 36000 Mtexels/sec | 33600 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 13440 Mpixels/sec |
| Unified Shaders | 800 | 800 |
| Texture Mapping Units | 40 | 40 |
| Render Output Units | 16 | 16 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 128-bit | 256-bit |
| Fab Process | 40 nm | 40 nm |
| Transistors | 1040 million | 1700 million |
| Bus | PCIe x16 | PCIe 2.1 x16 |
| DirectX Version | DirectX 11 | DirectX 11 |
| OpenGL Version | OpenGL 4.1 | OpenGL 4.1 |
Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it should 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, HDR and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core 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 per second.
Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.
Radeon HD 6770 1GBAmazon.com
Check prices at:
|
Radeon HD 6790Amazon.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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