NVIDIA GeForce GTX 870M 's Advantages
Released 3 years and 2 months late
Boost Clock967MHz
More VRAM (3GB vs 1024GB)
Larger VRAM bandwidth (120.0GB/s vs 12.80GB/s)
1296 additional rendering cores
NVIDIA GeForce GT 520M 's Advantages
Lower TDP (12W vs 100W)