NVIDIA GeForce GT 755M Mac Edition 's Advantages
Larger VRAM bandwidth (80.00GB/s vs 14.40GB/s)
128 additional rendering cores
NVIDIA GeForce 920MX 's Advantages
Released 2 years and 4 months late
Boost Clock993MHz
More VRAM (2GB vs 1024GB)
Lower TDP (16W vs 50W)