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Differences What are the advantages of each

Front view of GeForce GTX 675MX Mac

Reasons to consider the
Nvidia GeForce GTX 675MX Mac

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Higher memory bandwidth 160 GB/s vs 80 GB/s 2x higher memory bandwidth
Better floating-point performance 1,932.7 GFLOPS vs 729.6 GFLOPS Around 2.8x better floating-point performance
Higher texture rate 80.5 GTexel/s vs 30.4 GTexel/s Around 2.8x 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 20.13 GPixel/s vs 7.6 GPixel/s Around 2.8x 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 T-Rex score 2.1 frames/s vs 0.78 frames/s Around 2.8x better T-Rex 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 719 MHz More than 30% higher clock speed
Lower TDP 50W vs 100W 2x lower TDP

Benchmarks Real world tests of GeForce GTX 675MX Mac vs 660M Mac

Face detection Data courtesy CompuBench

GeForce GTX 675MX Mac
22.66 mPixels/s
GeForce GTX 660M Mac
11.24 mPixels/s

Ocean surface simulation Data courtesy CompuBench

GeForce GTX 675MX Mac
-1 frames/s
GeForce GTX 660M Mac
301.55 frames/s

T-Rex (Compubench 1.5) Data courtesy CompuBench

GeForce GTX 675MX Mac
2.1 frames/s
GeForce GTX 660M Mac
0.78 frames/s

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