NVIDIA GeForce GTX 780M Mac Edition 's Advantages
Boost Clock797MHz
More VRAM (4GB vs 2GB)
Lower TDP (122W vs 250W)
AMD Radeon R9 M395 Mac Edition 's Advantages
Released 1 years and 6 months late
Larger VRAM bandwidth (174.7GB/s vs 160.0GB/s)
256 additional rendering cores