ATI Radeon HD 3870 Mac Edition 's Advantages
Lower TDP (106W vs 150W)
AMD Radeon R9 270 1024SP 's Advantages
Released 6 years and 9 months late
Boost Clock925MHz
More VRAM (2GB vs 512GB)
Larger VRAM bandwidth (153.6GB/s vs 72.06GB/s)
704 additional rendering cores