Mar. 9, 2015 - 8:50 AM PDT
Performance Findings
The C4 family on average had 13 percent higher floating point calculation performance than the C3 family. The c4.8xlarge VMs improved 21 percent higher on average floating point performance over the c3.8xlarge VMs.
http://research.gigaom.com/chart/aws-ec2-c3c4-multicore-floating-point-performance-comparison/
