Re: Powerful 1 room setup.
Use 8 Raspberry Pi boards linked by GPIO to build a simple server, and then 1 RPi each for terminals. For up to about 30 terminals you would only need 1 ATX power supply for everything (except the displays). This would be a quite effective system for many applications, including a class room environment. You could even take it a step further and distribute processing across the terminals as well, giving the multi threaded combined power of up to 38 RPi's per work cluster.
RPi = The best ARM based RISC OS computer around
More than 95% of posts made from RISC OS on RPi 1B/1B+ computers. Most of the rest from RISC OS on RPi 2B/3B/3B+ computers
More than 95% of posts made from RISC OS on RPi 1B/1B+ computers. Most of the rest from RISC OS on RPi 2B/3B/3B+ computers
Re: Powerful 1 room setup.
You'd be better off to use Ethernet to link the Pis, through a PCB would work nicely to get power to the boards.
Re: Powerful 1 room setup.
The terminal Pis would be linked by Ethernet, though for the main box GPIO (using DMA) can comunicate a good bit faster. Also this would reduce the cost of the server box as only one board would have to have Ethernet, thus the rest could be $25 Rev A devices. Should note I do not think that a PCB should be used, rather a bit of cabling.
RPi = The best ARM based RISC OS computer around
More than 95% of posts made from RISC OS on RPi 1B/1B+ computers. Most of the rest from RISC OS on RPi 2B/3B/3B+ computers
More than 95% of posts made from RISC OS on RPi 1B/1B+ computers. Most of the rest from RISC OS on RPi 2B/3B/3B+ computers