Windows Server Standard is available in 4-core packs. The number of core licenses required equals the number of physical cores on the licensed server, subject to a minimum of 8 core licenses per physical processor Additional cores can be licensed in increments of 4 cores for gradual increases in core density growth. Virtualization : When all physical cores on a server are licensed, with a minimum of 8 core per physical processor and a minimum of 16 core licenses per server you can use up to one Operating System Environments (OSEs) or Hyper-V containers and unlimited Windows Server containers on the licensed server. For each additional VMs, all the physical cores in the server must be licensed again.