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Differences What are the advantages of each

Front view of GeForce GTX 775M Mac

Reasons to consider the
Nvidia GeForce GTX 775M Mac

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Higher memory bandwidth 160 GB/s vs 80 GB/s 2x higher memory bandwidth
More memory 2,048 MB vs 512 MB 4x more memory
Better floating-point performance 2,142.3 GFLOPS vs 729.6 GFLOPS Around 3x better floating-point performance
Higher texture rate 89.3 GTexel/s vs 30.4 GTexel/s Around 3x higher texture rate
Significantly more texture mapping units 112 vs 32 80 more texture mapping units
Significantly more shading units 1,344 vs 384 960 more shading units
Higher pixel rate 22.32 GPixel/s vs 7.6 GPixel/s Around 3x higher pixel rate
More render output processors 32 vs 16 Twice as many render output processors
Significantly wider memory bus 256 bit vs 128 bit 2x wider memory bus
Better face detection score 30.36 mPixels/s vs 11.24 mPixels/s Around 2.8x better face detection score
Front view of GeForce GTX 660M Mac

Reasons to consider the
Nvidia GeForce GTX 660M Mac

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Higher clock speed 950 MHz vs 797 MHz Around 20% higher clock speed
Lower TDP 50W vs 100W 2x lower TDP

Benchmarks Real world tests of GeForce GTX 775M Mac vs 660M Mac

Bitcoin mining Data courtesy CompuBench

GeForce GTX 775M Mac
66.6 mHash/s
GeForce GTX 660M Mac
16.56 mHash/s

Face detection Data courtesy CompuBench

GeForce GTX 775M Mac
30.36 mPixels/s
GeForce GTX 660M Mac
11.24 mPixels/s

Ocean surface simulation Data courtesy CompuBench

GeForce GTX 775M Mac
1,075.94 frames/s
GeForce GTX 660M Mac
301.55 frames/s

Particle simulation Data courtesy CompuBench

GeForce GTX 775M Mac
280.4 mInteraction/s
GeForce GTX 660M Mac
123.43 mInteraction/s

T-Rex (Compubench 1.5) Data courtesy CompuBench

GeForce GTX 775M Mac
3.11 frames/s
GeForce GTX 660M Mac
0.78 frames/s

Video composition Data courtesy CompuBench

GeForce GTX 775M Mac
56.67 frames/s
GeForce GTX 660M Mac
16.08 frames/s

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