http://blogs.technet.com/b/justin_gao/archive/2012/09/05/you-need-to-know-windows-server-2012-rtm-hyper-v-scale-final.aspxHi All : Throughout the development of Windows Server 2012, we have regularly pushed the scale boundaries as test resources and engineering schedule allowed. For example, in pushing Hyper-V scale to support up to 64 virtual processors per VM, it isn’ten-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)