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Differences What are the advantages of each

Front view of GeForce GTX 660M Mac

Reasons to consider the
Nvidia GeForce GTX 660M Mac

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Significantly higher effective memory clock speed 5,000 MHz vs 1,800 MHz More than 2.8x higher effective memory clock speed
Higher memory bandwidth 80 GB/s vs 14.4 GB/s More than 5.5x higher memory bandwidth
Significantly higher memory clock speed 1,250 MHz vs 900 MHz Around 40% higher memory clock speed
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Front view of GeForce 920M

Reasons to consider the
Nvidia GeForce 920M

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More memory 2,048 MB vs 512 MB 4x more memory
Slightly lower TDP 33W vs 50W Around 35% lower TDP

Benchmarks Real world tests of GeForce GTX 660M Mac vs 920M

Bitcoin mining Data courtesy CompuBench

GeForce GTX 660M Mac
16.56 mHash/s
GeForce 920M
40.41 mHash/s

Face detection Data courtesy CompuBench

GeForce GTX 660M Mac
11.24 mPixels/s
GeForce 920M
8.36 mPixels/s

Ocean surface simulation Data courtesy CompuBench

GeForce GTX 660M Mac
301.55 frames/s
GeForce 920M
157.17 frames/s

Particle simulation Data courtesy CompuBench

GeForce GTX 660M Mac
123.43 mInteraction/s
GeForce 920M
161.39 mInteraction/s

T-Rex (Compubench 1.5) Data courtesy CompuBench

GeForce GTX 660M Mac
0.78 frames/s
GeForce 920M
0.84 frames/s

Video composition Data courtesy CompuBench

GeForce GTX 660M Mac
16.08 frames/s
GeForce 920M
15.36 frames/s

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