GeForce GTX 660M Mac 

Released April, 2013
  • 950 MHz
  • 512 MB GDDR5

These chips are still based on Kepler (600-series), but feature more CUDA cores, more memory, a wider memory bus, and faster clockspeeds.
by Tim-Verry (Jun, 2013)
Looking at HD 4000 performance with Core i5 ULV and Core i7 quad-core, you can see that the quad-core part is anywhere from 0% to around 60% faster.
by Jarred-Walton (Apr, 2013)

Benchmarks Real world tests of the GeForce GTX 660M Mac

Bitcoin mining Data courtesy CompuBench

GeForce GTX 660M Mac
16.56 mHash/s
GeForce GTX 850M
152.76 mHash/s
GeForce GTX 880M
98.81 mHash/s

Face detection Data courtesy CompuBench

GeForce GTX 660M Mac
11.24 mPixels/s
GeForce GTX 850M
37.81 mPixels/s
GeForce GTX 880M
16.71 mPixels/s

Ocean surface simulation Data courtesy CompuBench

GeForce GTX 660M Mac
301.55 frames/s
GeForce GTX 880M
1,072.24 frames/s
GeForce GTX 850M
388.64 frames/s

Particle simulation Data courtesy CompuBench

GeForce GTX 660M Mac
123.43 mInteraction/s
GeForce GTX 850M
445.63 mInteraction/s
GeForce GTX 880M
361.87 mInteraction/s

T-Rex (Compubench 1.5) Data courtesy CompuBench

GeForce GTX 660M Mac
0.78 frames/s
GeForce GTX 880M
3.82 frames/s
GeForce GTX 850M
2.42 frames/s

Video composition Data courtesy CompuBench

GeForce GTX 660M Mac
16.08 frames/s
GeForce GTX 880M
63.34 frames/s
GeForce GTX 850M
39.28 frames/s

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There has been lately a debate on how Apple can cater to this problem: the company could mitigate the pain by offering three break-out box products, probably going with a Thunderbolt 2 for the drive.

Specifications Full list of technical specs

gpu

GPU brand Nvidia
GPU name GK107
Market Laptop
Clock speed 950 MHz
Is dual GPU No
Reference card None

raw performance

Shading units 384
Texture mapping units 32
Render output processors 16
Pixel rate 7.6 GPixel/s
Texture rate 30.4 GTexel/s
Floating-point performance 729.6 GFLOPS

memory

Memory clock speed 1,250 MHz
Effective memory clock speed 5,000 MHz
Memory bus 128 bit
Memory 512 MB
Memory type GDDR5
Memory bandwidth 80 GB/s

noise and power

TDP 50W
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