NVIDIA GeForce GTX 680M 's Advantages
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (115.2GB/s vs 16.02GB/s)
960 additional rendering cores
NVIDIA GeForce 930A 's Advantages
Released 2 years and 9 months late
Boost Clock has increased by 24% (941MHz vs 758MHz)
Lower TDP (33W vs 100W)