AMD Radeon R9 M290X Mac Edition 's Advantages
Released 2 years and 3 months late
Boost Clock975MHz
More VRAM (2GB vs 1024GB)
Larger VRAM bandwidth (174.7GB/s vs 28.80GB/s)
928 additional rendering cores
NVIDIA GeForce GT 620M 's Advantages
Lower TDP (15W vs 80W)