vSphere 5.5 vSphere 6.0 vSphere 6.5 Released date Sep-13 March 2015 Nov-16 Physical CPUs per host 320 480 576 Physical RAM per host 4 TB 12 TB 12 TB VMs per host 512 1024 1024 vCPU per VM 64 128 128 vRAM per VM 1 TB 4 TB 6 TB VMDK Size 62 TB 62 TB 62 TB Cluster Size 32 64 64 High Availability Reactive HA Reactive HA Proactive HA vSphere Integrated Containers NO NO YES VM Hardware Version 10 11 13 VMFS Version 5.6 5.61 6.81 Management vSphere Web Client (c#) vSphere Web Client (c#) vSphere Web Client -HTML 5 Client Authentication Management Single Sign-On 5.5 Platform Services Controller Platform Services Controller