NVIDIA GeForce GT 550M 's Advantages
Lower TDP (35W vs 122W)
NVIDIA GeForce GTX 680MX Mac Edition 's Advantages
Released 1 years and 9 months late
More VRAM (2GB vs 1024GB)
Larger VRAM bandwidth (160.0GB/s vs 28.80GB/s)
1440 additional rendering cores