NVIDIA Tesla K80 's Advantages
More VRAM (12GB vs 8GB)
704 additional rendering cores
NVIDIA Quadro P4000 's Advantages
Released 2 years and 3 months late
Boost Clock has increased by 80% (1480MHz vs 824MHz)
Larger VRAM bandwidth (243.3GB/s vs 240.6GB/s)
Lower TDP (105W vs 300W)