NVIDIA GeForce GTX 680MX Mac Edition 's Advantages
More VRAM (2GB vs 1GB)
Larger VRAM bandwidth (160.0GB/s vs 14.40GB/s)
1152 additional rendering cores
NVIDIA GeForce 825M 's Advantages
Released 1 years and 3 months late
Boost Clock941MHz
Lower TDP (33W vs 122W)