AMD Radeon R9 M290X 's Advantages
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (153.6GB/s vs 16.02GB/s)
896 additional rendering cores
NVIDIA GeForce 940MX 's Advantages
Released 2 years late
Boost Clock has increased by 38% (1242MHz vs 900MHz)
Lower TDP (23W vs 100W)