NVIDIA GeForce GTX 680 Mac Edition 's Advantages
Boost Clock has increased by 14% (1058MHz vs 928MHz)
Lower TDP (195W vs 250W)
NVIDIA GeForce GTX 780 Ti 6 GB 's Advantages
More VRAM (6GB vs 2GB)
Larger VRAM bandwidth (336.6GB/s vs 192.3GB/s)
1344 additional rendering cores