With the release candidate version of Windows Server 2008 R2 and Microsoft Hyper-V Server 2008 R2 we have added a new feature called “Processor Compatibility”.

The purpose behind this feature is to allow you to live migrate virtual machines between different processor types (from the same manufacturer) without any downtime. This functionality is configurable through a simple check box on the processor settings page for the virtual machine. If you select to enable your virtual machine to Migrate to a physical computer with a different processor version then we make sure that the virtual machine can be migrated. We do this by hiding advanced processor features from the virtual machine, so it can run on any version of the processor.

Source: http://blogs.msdn.com/virtual_pc_guy/archive/2009/06/09/processor-compatibility-in-hyper-v-r2.aspx

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