AMD Radeon HD 6970M Mac Edition 's Advantages
More VRAM (2GB vs 1GB)
Larger VRAM bandwidth (115.2GB/s vs 14.40GB/s)
576 additional rendering cores
NVIDIA GeForce 825M 's Advantages
Released 2 years and 5 months late
Boost Clock941MHz
Lower TDP (33W vs 75W)