AMD Radeon R9 M290X Mac Edition 's Advantages
Released 2 years and 10 months late
Boost Clock has increased by 77% (975MHz vs 550MHz)
More VRAM (2GB vs 1GB)
Larger VRAM bandwidth (174.7GB/s vs 14.40GB/s)
624 additional rendering cores
AMD Radeon HD 7550M 's Advantages
Lower TDP (14W vs 80W)