NVIDIA GeForce GT 650M Mac Edition 's Advantages
Lower TDP (45W vs 80W)
AMD Radeon R9 M290X Mac Edition 's Advantages
Released 2 years and 4 months late
Boost Clock975MHz
More VRAM (2GB vs 512GB)
Larger VRAM bandwidth (174.7GB/s vs 80.26GB/s)
640 additional rendering cores