VMWare/VirtualBox vCPU

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http://serverfault.com – If I install VMWare workstation or VirtualBox, it uses my REAL hardware. I know that there is a virtualization platform that can create vCPU (virtual CPU). I can tell the vCPU how much ghz to use from each of my cores. Do you know if this is possible using VMWare/VirtualBox ? Or do I have to install a server version of any product ? Open Source is always preffered :-) Thanks ! (HowTos)