The EVC mode is enabled on the cluster when the cluster is created, or by editing the properties of the cluster. The EVC baseline is selected based on the processor manufacturer (EVC for AMD hosts or EVC for Intel hosts). The selected baseline compatibility is validated against all hosts in the cluster.
The following screenshot shows the EVC mode enabled for Intel hosts and the mode set to Intel "Sandy Bridge" Generation:
Example EVC configuration
The EVC baseline configuration and the processor supported for each EVC baseline can be found in the VMware Knowledge Base at http://kb.vmware.com/kb/1003212.