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GeForce GTX 660 vs Radeon HD 6790

Intro

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

Compare that to the Radeon HD 6790, which features core clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 TAUs 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 will be 7% faster than the Radeon HD 6790 overall, because of its higher data rate. (explain)

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

Texel Rate

The GeForce GTX 660 should be much (approximately 133%) more effective at AF than the Radeon HD 6790. (explain)

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

Pixel Rate

The GeForce GTX 660 is a lot (about 75%) faster with regards to AA than the Radeon HD 6790, and also capable of handling higher resolutions without slowing down too much. (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

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Radeon HD 6790

Amazon.com

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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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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