NVIDIA GeForce 8400M GS 's Advantages
Lower TDP (11W vs 122W)
NVIDIA GeForce GTX 680MX Mac Edition 's Advantages
Released 5 years and 5 months late
More VRAM (2GB vs 256GB)
Larger VRAM bandwidth (160.0GB/s vs 6.400GB/s)
1520 additional rendering cores