NVIDIA Quadro K4100M 's Advantages
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (102.4GB/s vs 48.06GB/s)
768 additional rendering cores
NVIDIA Quadro P520 Mobile 's Advantages
Released 5 years and 10 months late
Boost Clock1493MHz
Lower TDP (18W vs 100W)