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GeForce GTX 660 vs Radeon HD 6790

Intro

The GeForce GTX 660 makes use of a 28 nm design. nVidia has clocked the core speed at 980 MHz. The GDDR5 memory is set to run at a frequency of 1502 MHz on this particular model. It features 960 SPUs as well as 80 TAUs and 24 Rasterization Operator Units.

Compare all that to the Radeon HD 6790, which comes with clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator 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 6790 2150 points
Difference: 2913 (135%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
Radeon HD 6790 150 Watts
Difference: 10 Watts (7%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 should perform just a bit faster than the Radeon HD 6790 overall. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 9792 (7%)

Texel Rate

The GeForce GTX 660 is quite a bit (more or less 133%) better at anisotropic filtering than the Radeon HD 6790. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 44800 (133%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 660 is the winner, by far. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 10080 (75%)

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 6790

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 6790
Manufacturer nVidia AMD
Year September 2012 April 2011
Code Name GK106 Barts LE
Memory 2048 MB 1024 MB
Core Speed 980 MHz 840 MHz
Memory Speed 6008 MHz 4200 MHz
Power (Max TDP) 140 watts 150 watts
Bandwidth 144192 MB/sec 134400 MB/sec
Texel Rate 78400 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 960 800
Texture Mapping Units 80 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 2540 million 1700 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, 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 anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels 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 Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of 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 6790

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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