GPUBoss Review Our evaluation of 660M vs 755M

Gaming

Real world tests using the latest 3D games

BioShock Infinite and Crysis 3

Benchmarks

Synthetic tests to measure overall performance

Passmark, 3DMark 11 Graphics, 3DMark Vantage Graphics and 3DMark06

Compute Performance

General computing tests executed on the GPU

Passmark Direct Compute and CLBenchmark Raytrace

GPUBoss Score

Gaming, Benchmarks and Compute Performance

Winner
Nvidia GeForce GT 755M 

GPUBoss recommends the Nvidia GeForce GT 755M  based on its .

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VS

Differences What are the advantages of each

Front view of GeForce GTX 660M

Reasons to consider the
Nvidia GeForce GTX 660M

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Slightly better CLBenchmark raytrace score 43,913 vs 40,022 Around 10% better CLBenchmark raytrace score
Front view of GeForce GT 755M

Reasons to consider the
Nvidia GeForce GT 755M

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Higher clock speed 980 MHz vs 835 MHz More than 15% higher clock speed
Higher effective memory clock speed 5,400 MHz vs 4,000 MHz 35% higher effective memory clock speed
Higher memory bandwidth 86.4 GB/s vs 64 GB/s More than 35% higher memory bandwidth
Significantly higher pixel rate 15.7 GPixel/s vs 6.68 GPixel/s More than 2.2x higher pixel rate
Slightly better 3DMark vantage graphics score 11,600 vs 9,803 Around 20% better 3DMark vantage graphics score
Significantly higher memory clock speed 1,350 MHz vs 1,000 MHz 35% higher memory clock speed
Higher crysis 3 framerate 12.4 fps vs 10 fps Around 25% higher crysis 3 framerate

Benchmarks Real world tests of GeForce GTX 660M vs GT 755M

Passmark Industry standard benchmark for overall graphics card performance

Besides the above slide, NVIDIA provided some performance estimates using results from the 3DMark 11 Performance benchmark, and the results are even more heavily in favor of NVIDIA.
GeForce GT 755M | by Jarred-Walton (Apr, 2013)

3DMark 11 Graphics Industry standard benchmark that tests DirectX 11 GPU performance

3DMark11 and Unigine Heaven give us a way to see how the cards stack up in a more synthetic environment while the real-world gameplay testing provided by the six games completes the performance picture.
GeForce GTX 660M | by Ryan-Shrout (Sep, 2012)

BioShock Infinite 1920 x 1080 - Ultra preset + DX11 (DDOF)

GeForce GTX 660M
22.9 fps
GeForce GT 755M
24.2 fps

Crysis 3 1920 x 1080 - Very High preset + 16xAF + 2xSMAA

By utilizing some advanced DX11 features as well as impressively high-quality shading routines this title pushes our graphics in way we have seen since the first days of Crysis.
GeForce GTX 660M | by Ryan-Shrout (Sep, 2012)

Passmark Direct Compute Measures performance of general-purpose computing using Microsoft DirectCompute

CLBenchmark Raytrace Measures compute performance using OpenCL to do raytracing

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