AMD Radeon R9 M390 Mac Edition 's Advantages
Released 6 years and 11 months late
More VRAM (2GB vs 512GB)
Larger VRAM bandwidth (174.7GB/s vs 48.00GB/s)
704 additional rendering cores
ATI Mobility Radeon HD 3850 X2 's Advantages
Lower TDP (70W vs 80W)