Following is the chart for supporting Hot Add memory and Hot Plug vCPU.
By default, virtual machines don’t support Hot Add (add RAM) and Hot Plug (add vCPU). You need to enable this capability on a per-VM basis in order to use it. To do so, you must first shut down the virtual machine since you can’t modify these settings while it’s running. Then, open the virtual machine’s properties, navigate to the Options tab and choose the Memory/CPU Hotplug option in the Advanced section. At the right-hand side of the window, note that there are two section – one for memory and one for CPU. Choose the options you like and then click OK.