Mar. 9, 2015 - 8:48 AM PDT
Performance Findings
For the same size VMs, the C4 family showed nearly identical public and private network throughput as the C3 family, with an average increase of 2% for public network throughput and 3% for private network throughput.
http://research.gigaom.com/chart/aws-ec2-c3c4-iperf-network-bandwidth-comparison/
