NVIDIA Quadro P4000 's Advantages
Released 2 years and 7 months late
Boost Clock has increased by 32% (1480MHz vs 1124MHz)
More VRAM (8GB vs 2GB)
Larger VRAM bandwidth (243.3GB/s vs 28.80GB/s)
1408 additional rendering cores
NVIDIA Quadro K620 's Advantages
Lower TDP (45W vs 105W)