C3 High-CPU Eight Extra Large c3.8xlarge 32 vCPUs $1.680000 hourly $1.168000 hourly $3.008000 hourly $2.631000 hourly
   
That pricing seems off to begin with, but I don't doubt that a cX instance is cheaper. Do you have any actual data to back up that HS\s ? If so I will be happy to retract my comment above. That V100 should more or less perform the same as 2x 1080ti + 8 vCPUS should be around 42 HS\s