Hi! since 6,9 we haven't been able to use our trendnet 10GBE card with unraid because the driver from Tehuti Networks tn40xx was not included because it didn't build. The company seems to have disappeared, but there is a third party driver here:
https://github.com/acooks/tn40xx-driver
Not sure how to install it or if you can use it in a future update.