AMD Radeon R9 M290X 's Advantages
Released 1 years and 8 months late
Boost Clock900MHz
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (153.6GB/s vs 50.24GB/s)
1184 additional rendering cores
NVIDIA GeForce GT 640M LE 's Advantages
Lower TDP (32W vs 100W)