Quadro K1200 Advantages
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (80.00GB/s vs 40.10GB/s)
256 additional rendering cores
Quadro P500 Mobile Advantages
Released 3 years late
Boost Clock has increased by 35% (1518MHz vs 1124MHz)
Lower TDP (18W vs 45W)