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GeForce GTX 660 vs Radeon HD 6950

Intro

The GeForce GTX 660 has a clock speed of 980 MHz and a GDDR5 memory frequency of 1502 MHz. It also makes use of a 192-bit bus, and uses a 28 nm design. It is comprised of 960 SPUs, 80 TAUs, and 24 ROPs.

Compare all that to the Radeon HD 6950, which features a clock speed of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It is comprised of 1408 SPUs, 88 TAUs, and 32 ROPs.

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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

Performance-wise, the Radeon HD 6950 should theoretically be just a bit better than the GeForce GTX 660 in general. (explain)

Radeon HD 6950 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%) faster with regards to AF than the Radeon HD 6950. (explain)

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

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6950 is a better choice, but not by far. (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

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.

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 max amount of information (counted in MB per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max 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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