[64 bit] Processor Upgrade

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http://ubuntuforums.org – I have a Ubuntu box set up that's main purpose is hosting vmware. I am considering upgrading the processor form an amd athlon ii x2 6000 to an amd phenom II x4 940. With this change will there need be a major. I have done this kind of upgrade a couple times in windows and once it was smooth with no issue, the other i had to reinstall windows. How does linux/ubuntu handle this? Will i need to reinstall unbuntu? I am running x64 version of v9.04. Thanks (Hardware)