NVIDIA GeForce 840A 's Advantages
Released 3 years and 2 months late
Boost Clock1124MHz
More VRAM (2GB vs 1024GB)
Larger VRAM bandwidth (16.02GB/s vs 12.80GB/s)
336 additional rendering cores
NVIDIA GeForce GT 520M 's Advantages
Lower TDP (12W vs 33W)