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GeForce GTX 660 vs Radeon HD 6950 2GB

Intro

The GeForce GTX 660 makes use of a 28 nm design. nVidia has clocked the core speed at 980 MHz. The GDDR5 RAM is set to run at a speed of 1502 MHz on this model. It features 960 SPUs as well as 80 Texture Address Units and 24 Rasterization Operator Units.

Compare all of that to the Radeon HD 6950 2GB, which makes use of a 40 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 RAM runs at a frequency of 1250 MHz on this specific card. It features 1408 SPUs along with 88 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
Radeon HD 6950 2GB 200 Watts
Difference: 60 Watts (43%)

Memory Bandwidth

In theory, the Radeon HD 6950 2GB should perform a little bit faster than the GeForce GTX 660 overall. (explain)

Radeon HD 6950 2GB 160000 MB/sec
GeForce GTX 660 144192 MB/sec
Difference: 15808 (11%)

Texel Rate

The GeForce GTX 660 should be a small bit (more or less 11%) more effective at AF than the Radeon HD 6950 2GB. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 6950 2GB 70400 Mtexels/sec
Difference: 8000 (11%)

Pixel Rate

The Radeon HD 6950 2GB should be just a bit (about 9%) more effective at full screen anti-aliasing than the GeForce GTX 660, and also able to handle higher screen resolutions better. (explain)

Radeon HD 6950 2GB 25600 Mpixels/sec
GeForce GTX 660 23520 Mpixels/sec
Difference: 2080 (9%)

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

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 Radeon HD 6950 2GB
Manufacturer nVidia AMD
Year September 2012 December 2010
Code Name GK106 Cayman Pro
Memory 2048 MB 2048 MB
Core Speed 980 MHz 800 MHz
Memory Speed 6008 MHz 5000 MHz
Power (Max TDP) 140 watts 200 watts
Bandwidth 144192 MB/sec 160000 MB/sec
Texel Rate 78400 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 960 1408
Texture Mapping Units 80 88
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 2540 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 (in units of MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher 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 texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 660

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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