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Radeon HD 7770 vs Radeon HD 7950 3GB
Intro
The Radeon HD 7770 comes with a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.Compare those specifications to the Radeon HD 7950 3GB, which makes use of a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this specific model. It features 1792 SPUs as well as 112 TAUs and 32 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7770 |
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80 Watts |
| Radeon HD 7950 3GB |
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200 Watts |
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Memory Bandwidth
The Radeon HD 7950 3GB should in theory perform much faster than the Radeon HD 7770 overall. (explain)
| Radeon HD 7950 3GB |
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240000 MB/sec |
| Radeon HD 7770 |
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72000 MB/sec |
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Texel Rate
The Radeon HD 7950 3GB should be quite a bit (approximately 124%) more effective at AF than the Radeon HD 7770. (explain)| Radeon HD 7950 3GB |
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89600 Mtexels/sec |
| Radeon HD 7770 |
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40000 Mtexels/sec |
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Pixel Rate
The Radeon HD 7950 3GB is much (approximately 60%) faster with regards to FSAA than the Radeon HD 7770, and also will be capable of handling higher screen resolutions better. (explain)| Radeon HD 7950 3GB |
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25600 Mpixels/sec |
| Radeon HD 7770 |
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16000 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 7770Amazon.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 7770 | Radeon HD 7950 3GB |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | February 2012 | January 2012 |
| Code Name | Cape Verde XT | Tahiti Pro |
| Memory | 1024 MB | 3072 MB |
| Core Speed | 1000 MHz | 800 MHz |
| Memory Speed | 4500 MHz | 5000 MHz |
| Power (Max TDP) | 80 watts | 200 watts |
| Bandwidth | 72000 MB/sec | 240000 MB/sec |
| Texel Rate | 40000 Mtexels/sec | 89600 Mtexels/sec |
| Pixel Rate | 16000 Mpixels/sec | 25600 Mpixels/sec |
| Unified Shaders | 640 | 1792 |
| Texture Mapping Units | 40 | 112 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 128-bit | 384-bit |
| Fab Process | 28 nm | 28 nm |
| Transistors | 1500 million | 4313 million |
| Bus | PCIe 3.0 x16 | PCIe 3.0 x16 |
| DirectX Version | DirectX 11.1 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.2 | OpenGL 4.2 |
Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, 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 number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.
Radeon HD 7770Amazon.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.
|
Comments
2 Responses to “Radeon HD 7770 vs Radeon HD 7950 3GB”no se olvides de las placas ati serie hd2xxx como la 2900tx que son de 512 bit puros 740 mhz de core y 1024 gddr4
y la linea 7 de nvidia como la 7950gx2 1 gb ram gddr3 256 bit x2 y y los core x2
Brilliant site.
Suggestion....
Can we choose between THREE cards in the future some time?
Much happier; because you can put in your current card and the choice between the two you are looking to buy.