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    Help getting 56Gb on ConnectX-3 Pros

    Hello, Long time, first time... I bought one of these 100G QSFP28 DAC Cable - 100GBASE-CR4 QSFP28 to QSFP28 to connect 2x Mellanox ConnectX-3 Pro ENs (MCX314A-BCCT) with, hoping to get 56Gbps out of them but they only negotiate at 10Gbps. According to Testing Results: Mellanox ConnectX-3 and...