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GeForce GTX 660 vs Radeon HD 6850

Intro

The GeForce GTX 660 uses a 28 nm design. nVidia has clocked the core frequency at 980 MHz. The GDDR5 RAM is set to run at a frequency of 1502 MHz on this card. It features 960 SPUs along with 80 TAUs and 24 ROPs.

Compare those specifications to the Radeon HD 6850, which comes with clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 960 SPUs as well as 48 Texture Address Units and 32 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 6850 2395 points
Difference: 2668 (111%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
GeForce GTX 660 140 Watts
Difference: 13 Watts (10%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 should in theory be a bit superior to the Radeon HD 6850 in general. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 6850 128000 MB/sec
Difference: 16192 (13%)

Texel Rate

The GeForce GTX 660 will be a lot (more or less 111%) faster with regards to texture filtering than the Radeon HD 6850. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 41200 (111%)

Pixel Rate

The Radeon HD 6850 will be a little bit (about 5%) better at anti-aliasing than the GeForce GTX 660, and able to handle higher resolutions more effectively. (explain)

Radeon HD 6850 24800 Mpixels/sec
GeForce GTX 660 23520 Mpixels/sec
Difference: 1280 (5%)

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 6850

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 6850
Manufacturer nVidia AMD
Year September 2012 October 2010
Code Name GK106 Barts Pro
Memory 2048 MB 1024 MB
Core Speed 980 MHz 775 MHz
Memory Speed 6008 MHz 4000 MHz
Power (Max TDP) 140 watts 127 watts
Bandwidth 144192 MB/sec 128000 MB/sec
Texel Rate 78400 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 960 960
Texture Mapping Units 80 48
Render Output Units 24 32
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 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 (in units of MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units of the card by the core 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the 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 6850

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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