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In the following question:

How do I attach two monitors in a dual head configuration?

Someone asks how to run two monitors on a Pi, and the answer was to chain 2 Pis together. That made me curious as to what the practical limitations were on chaining Pis together. Can I do this with 3, 4, etc... Pis? Is there a limit?

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Check out this link. I think it should help it is about how one guy did his http://www.southampton.ac.uk/~sjc/raspberrypi/

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Based on this press release (http://www.southampton.ac.uk/~sjc/raspberrypi/), it would appear that you can chain at least 20 together into a Lego Supercomputer.