ATI Radeon HD 3870 Mac Edition 's Advantages
Lower TDP (106W vs 185W)
AMD Radeon HD 7870 XT 's Advantages
Released 4 years and 5 months late
Boost Clock975MHz
More VRAM (2GB vs 512GB)
Larger VRAM bandwidth (192.0GB/s vs 72.06GB/s)
1216 additional rendering cores