Built my first VM on ESXi 5 hosts and thought this was interesting. When you configure the vCPU count now, you can specify # of virtual sockets and # of cores per vSocket. Basically, vCPU = #sockets x # cores and there is no performance difference from what I been reading. The only technical advantage I could find is that you can add virtual sockets to a running VM.
The purpose of this new way to configure vCPU seems to be for licensing trickery as stated in the reference article below...
Reference:
http://kendrickcoleman.com/index.php/Tech-Blog/vsphere-5-hardware-version-8-a-new-vcpu-config-for-licensing-trickery.html
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