ATI Mobility Radeon HD 5670 Mac Edition 's Advantages
Lower TDP (15W vs 80W)
AMD Radeon R9 M290X Mac Edition 's Advantages
Released 4 years and 7 months late
Boost Clock975MHz
More VRAM (2GB vs 512GB)
Larger VRAM bandwidth (174.7GB/s vs 25.44GB/s)
624 additional rendering cores