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GeForce GTX 660 vs Radeon HD 6870

Intro

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

Compare those specs to the Radeon HD 6870, which comes with core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 1120 SPUs as well as 56 TAUs 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 6870 2870 points
Difference: 2193 (76%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
Radeon HD 6870 151 Watts
Difference: 11 Watts (8%)

Memory Bandwidth

Performance-wise, the GeForce GTX 660 should theoretically be a small bit superior to the Radeon HD 6870 in general. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 9792 (7%)

Texel Rate

The GeForce GTX 660 will be much (approximately 56%) more effective at anisotropic filtering than the Radeon HD 6870. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 28000 (56%)

Pixel Rate

The Radeon HD 6870 will be much (approximately 22%) better at full screen anti-aliasing than the GeForce GTX 660, and capable of handling higher resolutions more effectively. (explain)

Radeon HD 6870 28800 Mpixels/sec
GeForce GTX 660 23520 Mpixels/sec
Difference: 5280 (22%)

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 6870

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 6870
Manufacturer nVidia AMD
Year September 2012 October 2010
Code Name GK106 Barts XT
Memory 2048 MB 1024 MB
Core Speed 980 MHz 900 MHz
Memory Speed 6008 MHz 4200 MHz
Power (Max TDP) 140 watts 151 watts
Bandwidth 144192 MB/sec 134400 MB/sec
Texel Rate 78400 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 960 1120
Texture Mapping Units 80 56
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: Memory bandwidth is the max amount of data (measured in MB per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 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 AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce GTX 660

Amazon.com

Check prices at:

Radeon HD 6870

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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