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Which part of MR? MR.com? MR Forums? MRLive.com? Each are run on separate servers separately iirc.

Now that you bring it up, it could be 3 of something, perhaps not the current Mac Mini's. Maybe in the future when octo-mini's come out.
 
Well I am sure that Macrumors runs on a load balancing Mysql servers.
 
Well I am sure that Macrumors runs on a load balancing Mysql servers.

I'd say that the MySQL server is at least on a separate, closed server, and the web server is shared through round-robin dns on the the servers, or, one of the servers is a test server, or one of the servers is a backup server.
 
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