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GeForce GTX 660 Ti vs Radeon HD 7950


The GeForce GTX 660 Ti makes use of a 28 nm design. nVidia has set the core speed at 915 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this particular model. It features 1344 SPUs along with 112 TAUs and 24 Rasterization Operator Units.

Compare those specs to the Radeon HD 7950, which features a clock frequency of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 384-bit bus, and makes use of a 28 nm design. It features 1792 SPUs, 112 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti 150 Watts
Radeon HD 7950 200 Watts
Difference: 50 Watts (33%)

Memory Bandwidth

In theory, the Radeon HD 7950 should be 67% quicker than the GeForce GTX 660 Ti overall, because of its higher bandwidth. (explain)

Radeon HD 7950 240000 MB/sec
GeForce GTX 660 Ti 144000 MB/sec
Difference: 96000 (67%)

Texel Rate

The GeForce GTX 660 Ti should be just a bit (more or less 14%) better at texture filtering than the Radeon HD 7950. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon HD 7950 89600 Mtexels/sec
Difference: 12880 (14%)

Pixel Rate

The Radeon HD 7950 is a bit (more or less 17%) more effective at AA than the GeForce GTX 660 Ti, and will be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 7950 25600 Mpixels/sec
GeForce GTX 660 Ti 21960 Mpixels/sec
Difference: 3640 (17%)

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

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GeForce GTX 660 Ti

Radeon HD 7950

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.


Display Specifications

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Model GeForce GTX 660 Ti Radeon HD 7950
Manufacturer nVidia AMD
Year August 2012 January 2012
Code Name GK104 Tahiti Pro
Memory 2048 MB 1536 MB
Core Speed 915 MHz 800 MHz
Memory Speed 6000 MHz 5000 MHz
Power (Max TDP) 150 watts 200 watts
Bandwidth 144000 MB/sec 240000 MB/sec
Texel Rate 102480 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1344 1792
Texture Mapping Units 112 112
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 3540 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total 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 the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.


One Response to “GeForce GTX 660 Ti vs Radeon HD 7950”
Điểm danh các dòng GTX 660 của các hãng tại Việt Nam - Page 2 says:

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