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GeForce GTX 660 vs Radeon HD 6950

Intro

The GeForce GTX 660 features core speeds of 980 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 RAM. It features 960 SPUs as well as 80 Texture Address Units and 24 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6950, which has a clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It features 1408 SPUs, 88 TAUs, and 32 Raster Operation Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 660 5063 points
Radeon HD 6950 3240 points
Difference: 1823 (56%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon HD 6950 should be 11% quicker than the GeForce GTX 660 overall, because of its greater data rate. (explain)

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

Texel Rate

The GeForce GTX 660 should be just a bit (about 11%) faster with regards to anisotropic filtering than the Radeon HD 6950. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6950 is the winner, but only just. (explain)

Radeon HD 6950 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

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Radeon HD 6950

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
Manufacturer nVidia AMD
Year September 2012 December 2010
Code Name GK106 Cayman Pro
Memory 2048 MB 1024 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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics 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 maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs 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 fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce GTX 660

Amazon.com

Check prices at:

Radeon HD 6950

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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