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GeForce GTX 660 vs Radeon HD 6970

Intro

The GeForce GTX 660 uses a 28 nm design. nVidia has clocked the core speed at 980 MHz. The GDDR5 memory runs at a speed of 1502 MHz on this particular card. It features 960 SPUs as well as 80 TAUs and 24 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6970, which comes with a core clock frequency of 880 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It features 1536 SPUs, 96 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 6970 3470 points
Difference: 1593 (46%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
Radeon HD 6970 250 Watts
Difference: 110 Watts (79%)

Memory Bandwidth

In theory, the Radeon HD 6970 should perform quite a bit faster than the GeForce GTX 660 in general. (explain)

Radeon HD 6970 176000 MB/sec
GeForce GTX 660 144192 MB/sec
Difference: 31808 (22%)

Texel Rate

The Radeon HD 6970 is just a bit (more or less 8%) better at texture filtering than the GeForce GTX 660. (explain)

Radeon HD 6970 84480 Mtexels/sec
GeForce GTX 660 78400 Mtexels/sec
Difference: 6080 (8%)

Pixel Rate

The Radeon HD 6970 should be a bit (more or less 20%) faster with regards to anti-aliasing than the GeForce GTX 660, and also will be capable of handling higher resolutions more effectively. (explain)

Radeon HD 6970 28160 Mpixels/sec
GeForce GTX 660 23520 Mpixels/sec
Difference: 4640 (20%)

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 6970

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 6970
Manufacturer nVidia AMD
Year September 2012 December 2010
Code Name GK106 Cayman XT
Memory 2048 MB 2048 MB
Core Speed 980 MHz 880 MHz
Memory Speed 6008 MHz 5500 MHz
Power (Max TDP) 140 watts 250 watts
Bandwidth 144192 MB/sec 176000 MB/sec
Texel Rate 78400 Mtexels/sec 84480 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 28160 Mpixels/sec
Unified Shaders 960 1536
Texture Mapping Units 80 96
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 (measured in megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, 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 of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. 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 many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce GTX 660

Amazon.com

Check prices at:

Radeon HD 6970

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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