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GeForce GTX 660 vs Radeon HD 6950 2GB

Intro

The GeForce GTX 660 features a GPU core speed of 980 MHz, and the 2048 MB of GDDR5 RAM runs at 1502 MHz through a 192-bit bus. It also is made up of 960 Stream Processors, 80 Texture Address Units, and 24 ROPs.

Compare those specifications to the Radeon HD 6950 2GB, which makes use of a 40 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this 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

As far as performance goes, the Radeon HD 6950 2GB should in theory be a little bit superior to 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 will be a little bit (approximately 11%) better at anisotropic filtering 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 will be just a bit (approximately 9%) faster with regards to FSAA than the GeForce GTX 660, and capable of handling higher resolutions more effectively. (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 max amount of information (measured in MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - 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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