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You mustn’t configure digital machines to make use of more CPU cores than are available physically. However, software help for I/O APICs has been unreliable with some OSes other than Windows. Also, the use of an I/O APIC slightly will increase the overhead of virtualization and due to this fact slows down the visitor OS a little. What role do sysadmins play in providing suggestions on new hardware purchases? Package – The physical component that contains one or more cores, similar to that shown in Figure 1 above. For a long time, Dennard Scaling was the reward that kept on giving.