NVIDIA GeForce 840M 's Advantages
Released 6 years and 4 months late
Boost Clock1124MHz
More VRAM (2GB vs 512GB)
320 additional rendering cores
Lower TDP (33W vs 50W)
NVIDIA GeForce 8800M GTS 's Advantages
Larger VRAM bandwidth (51.20GB/s vs 16.02GB/s)