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GeForce GTX 660 vs Radeon HD 6770

Intro

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

Compare all of that to the Radeon HD 6770, which comes with a GPU core clock speed of 900 MHz, and 512 MB of GDDR5 memory running at 1050 MHz through a 128-bit bus. It also is made up of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation 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 6770 1520 points
Difference: 3543 (233%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 108 Watts
GeForce GTX 660 140 Watts
Difference: 32 Watts (30%)

Memory Bandwidth

Performance-wise, the GeForce GTX 660 should in theory be much better than the Radeon HD 6770 overall. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 6770 67200 MB/sec
Difference: 76992 (115%)

Texel Rate

The GeForce GTX 660 is much (approximately 118%) better at anisotropic filtering than the Radeon HD 6770. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 6770 36000 Mtexels/sec
Difference: 42400 (118%)

Pixel Rate

The GeForce GTX 660 is much (approximately 63%) better at AA than the Radeon HD 6770, and should be able to handle higher resolutions more effectively. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon HD 6770 14400 Mpixels/sec
Difference: 9120 (63%)

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 6770

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 6770
Manufacturer nVidia AMD
Year September 2012 January 2011
Code Name GK106 Juniper XT
Memory 2048 MB 512 MB
Core Speed 980 MHz 900 MHz
Memory Speed 6008 MHz 4200 MHz
Power (Max TDP) 140 watts 108 watts
Bandwidth 144192 MB/sec 67200 MB/sec
Texel Rate 78400 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 960 800
Texture Mapping Units 80 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 128-bit
Fab Process 28 nm 40 nm
Transistors 2540 million 1040 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 maximum amount of information (in units of megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling 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 that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated 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 rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce GTX 660

Amazon.com

Check prices at:

Radeon HD 6770

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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