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At the scale of these networks, infiniband isn't "incredibly affordable".

It's surprisingly affordable I think you will find.

List prices alone are very attractive: 36-port QDR (40gbits) switch http://www.colfaxdirect.com/store/pc/viewPrd.asp?idproduct=1... Dual port QDR HBA http://www.colfaxdirect.com/store/pc/viewPrd.asp?idproduct=1...

The cost benefits are compounding when you go up to FDR (56Gbits) and make use of RDMA aware protocols, like iSER, SRP or SMB3.

"At the scale of these networks". These are warehouse-scale data centers.

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