vSphere 6 brings a handful of new features with the introduction of a new virtual machine compatibility level. The new enhancements include:
Support for 128 vCPUs
Support for 4 TB of RAM
Serial and parallel port enhancements
USB 3.0 xHCI controller
WDDM 1.1 GDI acceleration
Hot-add RAM enhancements to vNUMA
Prior to vSphere 6.0, when virtual NUMA was in use, all memory was allocated to region 0 in the event of hot-add. Now, when a vNUMA virtual machine has memory hot-added to it, that memory is allocated equally across all NUMA regions.
Serial and parallel ports can be removed from a virtual machine using vSphere 6.0 compatibility (virtual hardware version 11). Also, a virtual machine may now have up to 32 serial ports, which may be beneficial when virtualizing point-of-sale systems.
vSphere 6.0 also includes new support for the following guest operating systems:
Asianux 4 SP4
FreeBSD 9.3
Mac OS X 10.10
Oracle Linux 7
Oracle Unbreakable Enterprise Kernel Release...