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GeForce GTX 660 vs Radeon HD 6970

Intro

The GeForce GTX 660 has a clock speed of 980 MHz and a GDDR5 memory frequency of 1502 MHz. It also uses a 192-bit bus, and uses a 28 nm design. It is made up of 960 SPUs, 80 Texture Address Units, and 24 ROPs.

Compare those specs to the Radeon HD 6970, which features a clock frequency of 880 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1536 SPUs, 96 Texture Address Units, 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

Theoretically, the Radeon HD 6970 should perform much 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 will be a little bit (approximately 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 will be a bit (about 20%) faster with regards to AA than the GeForce GTX 660, and also will be able to handle higher resolutions without losing too much performance. (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: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at 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 video card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory 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 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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