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GeForce GTX 660 Ti vs Radeon HD 6950 2GB

Intro

The GeForce GTX 660 Ti comes with a core clock frequency of 915 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 192-bit bus, and makes use of a 28 nm design. It is comprised of 1344 SPUs, 112 TAUs, and 24 Raster Operation Units.

Compare those specifications to the Radeon HD 6950 2GB, which uses a 40 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 RAM is set to run at a frequency of 1250 MHz on this particular card. It features 1408 SPUs along with 88 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 6950 2GB 200 Watts
Difference: 50 Watts (33%)

Memory Bandwidth

Theoretically, the Radeon HD 6950 2GB should be just a bit faster than the GeForce GTX 660 Ti overall. (explain)

Radeon HD 6950 2GB 160000 MB/sec
GeForce GTX 660 Ti 144000 MB/sec
Difference: 16000 (11%)

Texel Rate

The GeForce GTX 660 Ti is quite a bit (more or less 46%) more effective at texture filtering than the Radeon HD 6950 2GB. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon HD 6950 2GB 70400 Mtexels/sec
Difference: 32080 (46%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6950 2GB is superior to the GeForce GTX 660 Ti, though only just barely. (explain)

Radeon HD 6950 2GB 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

Amazon.com

Check prices at:

Radeon HD 6950 2GB

Amazon.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.

Specifications

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Model GeForce GTX 660 Ti Radeon HD 6950 2GB
Manufacturer nVidia AMD
Year August 2012 December 2010
Code Name GK104 Cayman Pro
Memory 2048 MB 2048 MB
Core Speed 915 MHz 800 MHz
Memory Speed 6000 MHz 5000 MHz
Power (Max TDP) 150 watts 200 watts
Bandwidth 144000 MB/sec 160000 MB/sec
Texel Rate 102480 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1344 1408
Texture Mapping Units 112 88
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 3540 million 2640 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher 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 amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core 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 lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 660 Ti

Amazon.com

Check prices at:

Radeon HD 6950 2GB

Amazon.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.

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