AMD Radeon HD 6850 1440SP Edition 's Advantages
Released 3 years and 7 months late
More VRAM (1024GB vs 512GB)
Larger VRAM bandwidth (128.0GB/s vs 108.8GB/s)
640 additional rendering cores
ATI Radeon HD 4870 Mac Edition 's Advantages
Lower TDP (150W vs 151W)