Although unusual, you might end up having hosts in a cluster with same make CPUs but with uncommon feature-sets. For vMotion to work, the underlying CPU features on the cluster hosts should be identical. With EVC you can now present a common CPU feature-set across the hosts to the virtual machines.
EVC should be enabled from the cluster settings page.
The following procedure will help you configure EVC on an ESXi cluster:
Connect to the vCenter Server and migrate all the VMs to another host which is not in the cluster.
From the vCenter's inventory home, navigate to the Hosts and Clusters view.
Select the cluster and navigate to Manage | Settings | VMware EVC and click on Edit… to bring-up the Change EVC Mode window.
In the Change EVC Mode window, select an EVC mode. You get to choose from two options:
Enable EVC for AMD Hosts
Enable EVC for Intel Hosts
Click on OK if the validation succeeds.
