NVIDIA GeForce GTX 870M 's Advantages
Released 2 years late
Boost Clock has increased by 2% (967MHz vs 950MHz)
More VRAM (3GB vs 1GB)
Larger VRAM bandwidth (120.0GB/s vs 28.80GB/s)
960 additional rendering cores
NVIDIA GeForce GT 650M 's Advantages
Lower TDP (45W vs 100W)