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Thank you for posting in Wired Communities. Can you share if the X710 is an onboard NIC or standalone network card?
Is the newer driver you mentioned refer to version 1.9.5 at https://downloadcenter.intel.com/download/25160/Ethernet-Intel-Network-Adapter-Driver-for-PCIe-40-Gigabit-Ethernet-Network-Connection-under-FreeBSD-?
What is the result of your firmware update to 6.01?
Please feel free to update me so that we can better check on this.