AMD Radeon HD 6630M Mac Edition 's Advantages
Lower TDP (26W vs 80W)
AMD Radeon R9 M290X Mac Edition 's Advantages
Released 3 years and 10 months late
Boost Clock975MHz
More VRAM (2GB vs 256GB)
Larger VRAM bandwidth (174.7GB/s vs 19.20GB/s)
544 additional rendering cores