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GeForce GTX 660 vs Radeon HD 7770
Intro
The GeForce GTX 660 features a core clock speed of 980 MHz and a GDDR5 memory speed of 1502 MHz. It also uses a 192-bit memory bus, and uses a 28 nm design. It is comprised of 960 SPUs, 80 TAUs, and 24 Raster Operation Units.Compare those specs to the Radeon HD 7770, which uses a 28 nm design. ATi has set the core speed at 1000 MHz. The GDDR5 RAM works at a speed of 1125 MHz on this card. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7770 |
|
80 Watts |
| GeForce GTX 660 |
|
140 Watts |
|
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Memory Bandwidth
The GeForce GTX 660 should theoretically perform much faster than the Radeon HD 7770 in general. (explain)
| GeForce GTX 660 |
|
144192 MB/sec |
| Radeon HD 7770 |
|
72000 MB/sec |
|
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Texel Rate
The GeForce GTX 660 is a lot (approximately 96%) more effective at texture filtering than the Radeon HD 7770. (explain)| GeForce GTX 660 |
|
78400 Mtexels/sec |
| Radeon HD 7770 |
|
40000 Mtexels/sec |
|
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Pixel Rate
The GeForce GTX 660 will be much (approximately 47%) faster with regards to anti-aliasing than the Radeon HD 7770, and will be able to handle higher screen resolutions better. (explain)| GeForce GTX 660 |
|
23520 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
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 660Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
|
Radeon HD 7770Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | GeForce GTX 660 | Radeon HD 7770 |
|---|---|---|
| Manufacturer | nVidia | ATi |
| Year | September 2012 | February 2012 |
| Code Name | GK106 | Cape Verde XT |
| Fab Process | 28 nm | 28 nm |
| Bus | PCIe 3.0 x16 | PCIe 3.0 x16 |
| Memory | 2048 MB | 1024 MB |
| Core Speed | 980 MHz | 1000 MHz |
| Shader Speed | 980 MHz | (N/A) MHz |
| Memory Speed | 1502 MHz (6008 MHz effective) | 1125 MHz (4500 MHz effective) |
| Unified Shaders | 960 | 640 |
| Texture Mapping Units | 80 | 40 |
| Render Output Units | 24 | 16 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 192-bit | 128-bit |
| DirectX Version | DirectX 11.1 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.3 | OpenGL 4.2 |
| Power (Max TDP) | 140 watts | 80 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 144192 MB/sec | 72000 MB/sec |
| Texel Rate | 78400 Mtexels/sec | 40000 Mtexels/sec |
| Pixel Rate | 23520 Mpixels/sec | 16000 Mpixels/sec |
Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the 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 number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in one 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 - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.
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