NVIDIA Quadro P4000 Max Q 's Advantages
More VRAM (8GB vs 2GB)
Larger VRAM bandwidth (192.3GB/s vs 80.13GB/s)
1280 additional rendering cores
NVIDIA Quadro P620 's Advantages
Released 1 years and 1 months late
Boost Clock has increased by 10% (1354MHz vs 1228MHz)
Lower TDP (40W vs 100W)