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10 G switch - Mellanox v Cisco

switch port rates:
         switch   xfer_mech.  cfg  rate(MB/s)  sndrCPU%
        --------  ----------  ---  ----------  --------
        mellanox     MPI      2x2   403.86      100
        mellanox     MPI      3x3   309.74      100
        mellanox     MPI      6x3   375.26      100  
        mellanox   sockets    2x2   796.02       67.0
        mellanox   sockets    3x3   322.96       22.0
        mellanox   sockets    6x3   439.09       17.1

           cisco     MPI      2x2   414.20      100
           cisco     MPI      3x3   401.30      100
           cisco     MPI      6x3   563.64      100  
           cisco   sockets    2x2   860.68       77.3
           cisco   sockets    3x3   887.85       51.4
           cisco   sockets    6x3   865.80       32.6

MPI over infiniband is much more efficient.