NVIDIA GeForce GTX 680 Mac Edition 's Advantages
Released 2 years late
Boost Clock1058MHz
More VRAM (2GB vs 1024GB)
Larger VRAM bandwidth (192.3GB/s vs 14.40GB/s)
1488 additional rendering cores
NVIDIA GeForce GT 520 PCI 's Advantages
Lower TDP (29W vs 195W)