NVIDIA GeForce GTX 680 Mac Edition 's Advantages
Larger VRAM bandwidth (192.3GB/s vs 105.8GB/s)
768 additional rendering cores
NVIDIA GeForce GTX 950 's Advantages
Released 2 years and 4 months late
Boost Clock has increased by 12% (1188MHz vs 1058MHz)
Lower TDP (90W vs 195W)