NVIDIA GeForce GTX 670M 's Advantages
More VRAM (1536GB vs 1024GB)
Larger VRAM bandwidth (72.00GB/s vs 14.40GB/s)
NVIDIA GeForce 825M 's Advantages
Released 1 years and 10 months late
Boost Clock941MHz
48 additional rendering cores
Lower TDP (33W vs 75W)