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GeForce GTX 660 vs GeForce GTX 980M

Intro

The GeForce GTX 660 uses a 28 nm design. nVidia has set the core speed at 980 MHz. The GDDR5 RAM runs at a speed of 1502 MHz on this specific model. It features 960 SPUs along with 80 TAUs and 24 Rasterization Operator Units.

Compare those specs to the GeForce GTX 980M, which makes use of a 28 nm design. nVidia has clocked the core frequency at 1038 MHz. The GDDR5 memory is set to run at a speed of 1000 MHz on this model. It features 1536 SPUs as well as 96 Texture Address Units and 64 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 980M 9476 points
GeForce GTX 660 5063 points
Difference: 4413 (87%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 980M 100 Watts
GeForce GTX 660 140 Watts
Difference: 40 Watts (40%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 will be 13% quicker than the GeForce GTX 980M overall, because of its greater bandwidth. (explain)

GeForce GTX 660 144192 MB/sec
GeForce GTX 980M 128000 MB/sec
Difference: 16192 (13%)

Texel Rate

The GeForce GTX 980M is much (more or less 27%) more effective at AF than the GeForce GTX 660. (explain)

GeForce GTX 980M 99648 Mtexels/sec
GeForce GTX 660 78400 Mtexels/sec
Difference: 21248 (27%)

Pixel Rate

The GeForce GTX 980M is quite a bit (more or less 182%) faster with regards to full screen anti-aliasing than the GeForce GTX 660, and will be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 980M 66432 Mpixels/sec
GeForce GTX 660 23520 Mpixels/sec
Difference: 42912 (182%)

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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GeForce GTX 980M

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 GeForce GTX 980M
Manufacturer nVidia nVidia
Year September 2012 October 7 2014
Code Name GK106 GM204
Memory 2048 MB 4096 MB
Core Speed 980 MHz 1038 MHz
Memory Speed 6008 MHz 4000 MHz
Power (Max TDP) 140 watts 100 watts
Bandwidth 144192 MB/sec 128000 MB/sec
Texel Rate 78400 Mtexels/sec 99648 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 66432 Mpixels/sec
Unified Shaders 960 1536
Texture Mapping Units 80 96
Render Output Units 24 64
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2540 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 12
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few 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:

GeForce GTX 980M

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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