AMD Radeon HD 7990 's Advantages
Released 4 years and 10 months late
Boost Clock1000MHz
More VRAM (3GB vs 512GB)
Larger VRAM bandwidth (288.0GB/s vs 72.06GB/s)
1728 additional rendering cores
ATI Radeon HD 3870 Mac Edition 's Advantages
Lower TDP (106W vs 375W)