A Cluster is parallel computing and that means that a Cluster is faster in running several programs parallel, especially if they communicate with each other or if electricity consumption is important.
So, the PI Cluster is not needed for running one software, but when four programs are running parallel like a database, a spread sheet software and e.g. IRC instead of Blender rendering a movie.
IRC is interesting, because it can run bots and add ftp connections. Imagine you can access That PI Cluster remotely and tell the bot to give you a set of data in form of a chart. IRC is one of the Cluster PIs. In this case the bot triggers the Spread Sheet Visual Basic on a 2nd Cluster PI to pull data from the Database on a 3rd Cluster and push the result to the FTP server on the 4th.
In this case all PIs would be used. If another user asks for the same data set only the IRC and FTP would be used.
Border rendering instead needs very short core connections giving a one CPU design a major advantage and real parallel computing is entirely software design depending in times of only multi core CPUs.
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