In the Software boundaries and limits for SharePoint 2013 article in Technet, Microsoft has added a new limit for the number of content databases (http://technet.microsoft.com/en-us/library/cc262787(v=office.15)#ContentDB). Beginning with SharePoint 2013 there is a limit of 500 content databases per farm as a supported limit.

But remember, when working with these number so content databases, the complete infrastructure has to be set up properly.

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