AMD Radeon Pro 555 's Advantages
Released 3 years and 7 months late
Lower TDP (75W vs 122W)
NVIDIA GeForce GTX 780M Mac Edition 's Advantages
Boost Clock797MHz
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (160.0GB/s vs 81.60GB/s)
768 additional rendering cores