Thanks for your reply.

I dont`t have one lying aroung. I tested with the 82598EB Copper 10Gbit and it worked fine.

We are planning to migrate from 1GBit to 10Gbit and are planning to buy several of these (up to 10). Each of them is around 500.- EUR so I first wanted to make sure that they are working. I wanted to order all of them at the same time because I am too lazy to first order 1 and then 9 ;-)