NVIDIA GeForce GTX 680M 's Advantages
More VRAM (4GB vs 1024GB)
Larger VRAM bandwidth (115.2GB/s vs 16.00GB/s)
1248 additional rendering cores
NVIDIA GeForce 720A 's Advantages
Released 2 years and 1 months late
Boost Clock has increased by 24% (938MHz vs 758MHz)
Lower TDP (33W vs 100W)