AMD Radeon HD 6770M Mac Edition 's Advantages
Lower TDP (35W vs 250W)
AMD Radeon R9 M395X Mac Edition 's Advantages
Released 4 years and 4 months late
More VRAM (4GB vs 512GB)
Larger VRAM bandwidth (174.7GB/s vs 57.60GB/s)
1568 additional rendering cores