NVIDIA GeForce GTX 680M 's Advantages
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (115.2GB/s vs 28.80GB/s)
704 additional rendering cores
AMD Radeon R9 M375 's Advantages
Released 2 years and 11 months late
Boost Clock has increased by 34% (1015MHz vs 758MHz)