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VirtualBox Graphic User Interface Version 4.1.2_Ubuntu r38459 (installed with Ubuntu Software Center)

Host OS: Ubuntu 11.10
Guest OS: Windows XP sp 3 (with guest additions installed)

I have search on Google about this topic but not find any help yet. I read some topic that say VirtualBox v 4 now support dynamic RAM allocation but I do not know how to enable this feature.

Can you show me how to enable it?

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up vote 8 down vote accepted

The feature you are searching for is called Memory Ballooning:

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Can you describe how exactly? And does this make the guest OS have more memory for it's running applications? – trusktr Jun 26 '13 at 17:35

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