vCloud Director supports the same set of guest operating systems as the backing ESXi hosts.
Starting with version 9.0, for each backing resource pool or cluster, vCloud Director supports the highest virtual hardware versions and guest operating systems that the backing ESXi hosts have in common. For example, if a cluster has a combination of ESXi hosts with versions 6.5 and 6.7, the highest supported virtual hardware version would be 13, which is the highest common virtual hardware version across all hosts in the cluster.
System administrators and organization administrators can configure the highest available hardware version to be lower than the highest supported hardware version. System administrators can configure the hardware version of a provider VDC to be any version between the lowest supported vmx-4 and the highest supported in the cluster. Organization administrators can configure the hardware version of an organization VDC to be any version between the lowest supported vmx-4 and the highest supported in the provider VDC.