Extra Large Virtual Machine Configuration

Hi,

We are looking at doing a virtualise only policy where i work instead of building windows physical servers. My question is if you have a Single host say 2 x 16 CORE + HT 64 logical. If the virtual machine requires 20 vCPUs would this be ok? I have read articles before that you shouldnt assign more vCPUs than a single physical core has. It will work but there will be a performance hit and its best to go 2 x 20 COREs so you can assign 20 vCPUs.

There will be no other VMs on this host only this single VM. Hot add of cpu & memory will be disabled so it doesnt impact numa.