NVIDIA GeForce GTX 780M Mac Edition 's Advantages
Boost Clock has increased by 28% (797MHz vs 625MHz)
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (160.0GB/s vs 72.00GB/s)
896 additional rendering cores
AMD Radeon E8860 's Advantages
Lower TDP (37W vs 122W)