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I did some searches, but I was unable to find a list of which CPU models support VT-x and which do not. Where can I find such a list?

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Try http://en.wikipedia.org/wiki/List_of_Intel_microprocessors for Intel (search for 'VT') and http://en.wikipedia.org/wiki/List_of_AMD_microprocessors for AMD (search for 'AMD-V').

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This wiki page has a reasonably good sample of both AMD (V) and Intel (VT-x) processors.

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Intel's ARK site is pretty awesome for finding out info on all Intel products (not just CPUs but motherboards, ethernet controllers, and chipsets).

ARK has a list of Intel CPUs that support VT-x here: http://ark.intel.com/VTList.aspx

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For intels there's a really nice page:

Just go there and choose the "Intel Advanced Virtualization Technology" in the feature list. That is the second page after choosing the processor family.

Anyone knows a similiar site for AMD? I think it's a real lack of care that they don't have it easily available...

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If you already have the CPU and you're using Linux you can check it programmatically like this:

$ grep ^flags /proc/cpuinfo | egrep '(vmx|svm}'

If this matches you have the virtualization CPU extensions (vmx==Intel, svm==AMD).

Make sure to enable VT in the system BIOS.

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http://intel.com for VT-x & http://amd.com V-x

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