AMD Radeon HD 6770M Mac Edition 's Advantages
Larger VRAM bandwidth (57.60GB/s vs 14.40GB/s)
96 additional rendering cores
Lower TDP (35W vs 50W)
AMD Radeon 620 Mobile 's Advantages
Released 8 years and 4 months late
Boost Clock1024MHz
More VRAM (2GB vs 512GB)