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GeForce GTX 660 Ti vs Radeon HD 7850
Intro
The GeForce GTX 660 Ti uses a 28 nm design. nVidia has set the core frequency at 915 MHz. The GDDR5 RAM works at a frequency of 1500 MHz on this specific model. It features 1344 SPUs along with 112 Texture Address Units and 24 ROPs.Compare all of that to the Radeon HD 7850, which uses a 28 nm design. AMD has clocked the core frequency at 860 MHz. The GDDR5 RAM works at a frequency of 1200 MHz on this specific card. It features 1024 SPUs along with 64 TAUs and 32 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7850 |
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130 Watts |
| GeForce GTX 660 Ti |
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150 Watts |
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Memory Bandwidth
The Radeon HD 7850, in theory, should perform just a bit faster than the GeForce GTX 660 Ti in general. (explain)
| Radeon HD 7850 |
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153600 MB/sec |
| GeForce GTX 660 Ti |
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144000 MB/sec |
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Texel Rate
The GeForce GTX 660 Ti should be quite a bit (about 86%) better at anisotropic filtering than the Radeon HD 7850. (explain)| GeForce GTX 660 Ti |
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102480 Mtexels/sec |
| Radeon HD 7850 |
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55040 Mtexels/sec |
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Pixel Rate
If running with high levels of AA is important to you, then the Radeon HD 7850 is a better choice, and very much so. (explain)| Radeon HD 7850 |
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27520 Mpixels/sec |
| GeForce GTX 660 Ti |
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21960 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
GeForce GTX 660 TiAmazon.com
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Radeon HD 7850Amazon.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 | GeForce GTX 660 Ti | Radeon HD 7850 |
|---|---|---|
| Manufacturer | nVidia | AMD |
| Year | August 2012 | March 2012 |
| Code Name | GK104 | Pitcairn Pro |
| Fab Process | 28 nm | 28 nm |
| Bus | PCIe 3.0 x16 | PCIe 3.0 x16 |
| Memory | 2048 MB | 2048 MB |
| Core Speed | 915 MHz | 860 MHz |
| Shader Speed | 915 MHz | (N/A) MHz |
| Memory Speed | 1500 MHz (6000 MHz effective) | 1200 MHz (4800 MHz effective) |
| Unified Shaders | 1344 | 1024 |
| Texture Mapping Units | 112 | 64 |
| Render Output Units | 24 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 192-bit | 256-bit |
| DirectX Version | DirectX 11.0 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.3 | OpenGL 4.2 |
| Power (Max TDP) | 150 watts | 130 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 144000 MB/sec | 153600 MB/sec |
| Texel Rate | 102480 Mtexels/sec | 55040 Mtexels/sec |
| Pixel Rate | 21960 Mpixels/sec | 27520 Mpixels/sec |
Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.
Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.
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