I see the upgrade to 2880 mb ram a better option.
Webserver/Database RAM comsuption is something hard to guess, and not ever equilibrated.
So if you have 2x1440, your apache/lighttpd/webserver can break 1440mb while mysql is using just 400mb or vice-versa.
With a single server, you have more flexibility: 1440+400 is 1840, still far from crashing or even slowing down the website access.
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