Well i can't tell about this 10g card, but for sure there is something Proxmox do not like about dual port card. During an hdd swap maintenance, i did install a fresh 8.1 iso, no update, and it do not see the second port of a real full price supermicro 25g dual port. even forcing the name via mac do nothing.. as it show a dmar error when loading up the 'second portion port.' Then i simply reboot to my esxi and all do run fine!