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C240 with slow Intel X540

We have two Cisco C240 servers running Windows Server 2008 R2 Datacenter with X540 cards directly connected with cat 6A cord and they only run 0.1 Gbps (1%) with iperf. What am I doing wrong?

Intel site lists driver as PROWinx64.exe version: 18.4 (Latest) Date: 07/19/2013, but Cisco installed Intel driver 3.9.58.9101 7/11/2014 and it seems to work other than the performance.

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