NVIDIA GeForce GTX 680M 's Advantages
More VRAM (4GB vs 3GB)
64 additional rendering cores
NVIDIA GeForce GTX 970M 's Advantages
Released 2 years and 4 months late
Boost Clock has increased by 37% (1038MHz vs 758MHz)
Larger VRAM bandwidth (120.3GB/s vs 115.2GB/s)