NVIDIA Tesla K40c 's Advantages
More VRAM (12GB vs 8GB)
Larger VRAM bandwidth (288.4GB/s vs 160.4GB/s)
1344 additional rendering cores
NVIDIA Tesla M6 's Advantages
Released 1 years and 10 months late
Boost Clock has increased by 35% (1180MHz vs 876MHz)
Lower TDP (100W vs 245W)