Hi Wowhiseh,
Please help by sharing your iperf testing paramters and the SSU logs.
You can download the Intel SSU at https://downloadcenter.intel.com/download/25293/Intel-System-Support-Utility, run the utitlity to generate the log then send to me.
thanks,
wb
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Re: X520-DA1 or X520-LR1 with Intel SFP+ extremely slow speed ...
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