NVIDIA GeForce GTX 860M 's Advantages
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (80.19GB/s vs 16.02GB/s)
256 additional rendering cores
NVIDIA GeForce 940MX 's Advantages
Released 2 years late
Boost Clock has increased by 14% (1242MHz vs 1085MHz)
Lower TDP (23W vs 75W)