EC2 provides enhanced networking capabilities through the Elastic Network Adapter (ENA).
EFA
Elastic Network Adapter (ENA) with added capabilities, such as an additional OS-bypass functionality (OS-bypass is not supported on Windows instances).
Doesn't support t2 or t3 instance types.
ENI
An elastic network interface is a logical networking component in a VPC that represents a virtual network card.
ParallelCluster
An AWS supported open source cluster management tool that helps you to deploy and manage high performance computing (HPC) clusters in AWS.