Talking about 10Gbps networking... and above: http://www.theregister.co.uk/2015/03/11/mellanox_adds_networking_specs_to_ocp/
"In the configuration Mellanox demonstrated, a 648-node cluster would only need 162 each of NICs, ports and cables." So looks like one switch port can fan out to four hosts, and they talk about mixing FPGA and GPU Might make for a very interesting cluster.
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