NVIDIA GeForce GT 650M Mac Edition 's Advantages
Lower TDP (45W vs 250W)
AMD Radeon R9 M395 Mac Edition 's Advantages
Released 2 years and 10 months late
More VRAM (2GB vs 512GB)
Larger VRAM bandwidth (174.7GB/s vs 80.26GB/s)
1408 additional rendering cores