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Is it possible to run a 64-bit OS as a guest on a 64-bit machine with VirtualBox? I'm guessing it should be, but I'd like to make sure.

Do some virtualization technologies allow a single guest machine to use multiple cores? I guess it should be possible, but my VirtualBox open-source edition doesn't seem to do it.

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You can even run 64-bit guests on 32-bit hosts (although when I tried it I just got blue screens). –  Tom Hawtin - tackline Sep 7 '09 at 11:28
    
Related Question: superuser.com/questions/24965/…. It explains what is needed to run x64 Guest on x64 Machines. Theoretically this is a duplicate of the mentioned question. –  Diago Sep 7 '09 at 11:38

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Yes, you can run a 64-bit OS as a guest with VirtualBox on a 64-bit host.

VirtualBox will definitely allow usage of multiple cores on guest machines, but it depends on your hardware - quintessentially your CPU.

For example, on certain Intel CPUs - especially the Duo Core (Celeron) series, it does not support VT-x technology, and also does not support EMT64 technology, thus you are limited to running only on a single core, and 32-bit guest OSes.

Check your processor, the defining factors are there.

Intel Processor Spec Finder

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Yes. Although, you need your BIOS to support virtualisation extensions

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Someone else did too. Really makes you want to answer, doesn't it? –  Rowland Shaw Sep 7 '09 at 17:06

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