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GeForce GTX 660 Ti vs Radeon HD 7850
Intro
The GeForce GTX 660 Ti has a core clock speed of 915 MHz and a GDDR5 memory frequency of 1500 MHz. It also features a 192-bit bus, and makes use of a 28 nm design. It is comprised of 1344 SPUs, 112 TAUs, and 24 ROPs.Compare those specs to the Radeon HD 7850, which comes with a core clock frequency of 860 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It features 1024 SPUs, 64 Texture Address Units, and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7850 |
|
130 Watts |
| GeForce GTX 660 Ti |
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150 Watts |
|
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Memory Bandwidth
As far as performance goes, the Radeon HD 7850 should theoretically be a little bit better than the GeForce GTX 660 Ti in general. (explain)
| Radeon HD 7850 |
|
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 will be a lot (more or less 86%) more effective at texture filtering than the Radeon HD 7850. (explain)| GeForce GTX 660 Ti |
|
102480 Mtexels/sec |
| Radeon HD 7850 |
|
55040 Mtexels/sec |
|
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Pixel Rate
If running with a high screen resolution is important to you, then the Radeon HD 7850 is the winner, and very much so. (explain)| Radeon HD 7850 |
|
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
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.
GeForce GTX 660 TiAmazon.com
Other US-based stores
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Radeon HD 7850Amazon.com
Other US-based stores
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Specifications
| Model | GeForce GTX 660 Ti | Radeon HD 7850 |
|---|---|---|
| Manufacturer | nVidia | ATi |
| 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 11.1 | 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 max amount of information (in units of MB per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If 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 high resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per 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 higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.
Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.
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