NVIDIA Tesla K40s 's Advantages
More VRAM (12GB vs 2GB)
Larger VRAM bandwidth (288.4GB/s vs 14.40GB/s)
2496 additional rendering cores
NVIDIA Quadro M500M 's Advantages
Released 2 years and 5 months late
Boost Clock has increased by 28% (1124MHz vs 876MHz)
Lower TDP (30W vs 245W)