Product : VMware, vSphere/6.0, Enterprise Plus
Feature : Max Memory / Host, Host Config , Hypervisor
Content Owner:  Roman Macek
Summary
12TB
Details
vSphere 6 Maximums
- 64 hosts per cluster (vSphere 5.x it was 32)
- 8000 VMs (previously 4000)
- 480 CPUs (vSphere 5.x it was 320 CPUs)
- 12 TB of RAM (vSphere 5.x it was 4 TB of RAM)
- 2048 VMs per host (vSphere 5.x it was 512 VMs).

Support for Reliable Memory Technology:
The vSphere ESXi Hypervisor runs directly in memory, an memory error can potentially crash it and the virtual machines running on the host. CPU hardware feature through which a region of memory is reported from the hardware to vSphere ESXi Hypervisor as being more “reliable. This information is then used to optimize the placement of the VMkernel and other critical components such as the initial thread, hostd and the watchdog process and helps guard against memory errors.