NVIDIA GeForce GTX 680MX Mac Edition 's Advantages
Larger VRAM bandwidth (160.0GB/s vs 96.19GB/s)
576 additional rendering cores
NVIDIA GeForce GTX 770M 's Advantages
Released 7 months late
Boost Clock797MHz
More VRAM (3GB vs 2GB)
Lower TDP (75W vs 122W)