ATI Radeon HD 5770 Mac Edition 's Advantages
Larger VRAM bandwidth (76.48GB/s vs 28.80GB/s)
480 additional rendering cores
AMD Radeon R7 240 's Advantages
Released 3 years and 3 months late
Boost Clock780MHz
More VRAM (2GB vs 1024GB)
Lower TDP (30W vs 108W)