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I'm running Virtualbox to run my server on CentOS

The thing is I have memory available on my Xserver 16 GB

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And the max I can up is only up to 4GB

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I don't know why I can't give it more?

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up vote 4 down vote accepted

I'm not a mac user, but are you booting up the host with the 64bit kernel? Is the program using the 64bit version?

Generally, a 4GB limit is an indication of a 32bit/64bit issue.

I found this article on VirtualBox's site with a user that is having the a similar issue. It may help you resolve your problem.

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