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Radeon HD 6770 1GB vs Radeon HD 7950 3GB
Intro
The Radeon HD 6770 1GB comes with a clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It features 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.Compare all that to the Radeon HD 7950 3GB, which makes use of a 28 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 memory is set to run at a frequency of 1250 MHz on this card. It features 1792 SPUs along with 112 TAUs and 32 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6770 1GB |
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108 Watts |
| Radeon HD 7950 3GB |
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200 Watts |
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Memory Bandwidth
Theoretically speaking, the Radeon HD 7950 3GB should be 257% faster than the Radeon HD 6770 1GB in general, because of its higher data rate. (explain)
| Radeon HD 7950 3GB |
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240000 MB/sec |
| Radeon HD 6770 1GB |
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67200 MB/sec |
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Texel Rate
The Radeon HD 7950 3GB is much (more or less 149%) faster with regards to AF than the Radeon HD 6770 1GB. (explain)| Radeon HD 7950 3GB |
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89600 Mtexels/sec |
| Radeon HD 6770 1GB |
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36000 Mtexels/sec |
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Pixel Rate
The Radeon HD 7950 3GB will be a lot (approximately 78%) more effective at AA than the Radeon HD 6770 1GB, and also will be able to handle higher screen resolutions better. (explain)| Radeon HD 7950 3GB |
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25600 Mpixels/sec |
| Radeon HD 6770 1GB |
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14400 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 7950 3GBAmazon.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 7950 3GB |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | January 2011 | January 2012 |
| Code Name | Juniper XT | Tahiti Pro |
| Memory | 1024 MB | 3072 MB |
| Core Speed | 900 MHz | 800 MHz |
| Memory Speed | 4200 MHz | 5000 MHz |
| Power (Max TDP) | 108 watts | 200 watts |
| Bandwidth | 67200 MB/sec | 240000 MB/sec |
| Texel Rate | 36000 Mtexels/sec | 89600 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 25600 Mpixels/sec |
| Unified Shaders | 800 | 1792 |
| Texture Mapping Units | 40 | 112 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 128-bit | 384-bit |
| Fab Process | 40 nm | 28 nm |
| Transistors | 1040 million | 4313 million |
| Bus | PCIe x16 | PCIe 3.0 x16 |
| DirectX Version | DirectX 11 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.1 | OpenGL 4.2 |
Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of texture units 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 per second.
Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output 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 7950 3GBAmazon.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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