
VM
With this new version of vSphere, there is a new version of the VM virtual hardware (version 13). Some limits and features (virtual RAM, NVMe controllers) are available only with the new virtual hardware 13; other limits are also valid for previous versions of virtual hardware. For more details refer to VMware vSphere Virtual Machine Administration guide at https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.vm_admin.doc/GUID-789C3913-1053-4850-A0F0-E29C3D32B6DA.htm.
The following table summarizes some of the maximums numbers for each VM in the different version of vSphere:

Table 1.1: Maximums numbers for each VM in the different version of vSphere
Those limits can change if you are using VMware FT to protect your VMs and the real limits, in this case, will be lower. More details will be provided in Chapter 13, Advanced Availability in vSphere 6.5.