I´ve got a problem with a server connection using the following combination:

IBM Server SystemX 3450 Typ:7379-K4G (PCIE x8 slot, 25w), running Windows Server2008R2

Intel Network Adapter X520-DA2

Intel TwinAxial Cable 3m (XDACBL3M)

D-Link switch DGS-1510-52

Problem:

10Gbit Link is up, but the performance is like 10Mbit. Gigabit connection with the internal adapter is much faster!

Even when i try to open the management gui of the adapter it takes several seconds to open and everything seems to be very slow.

As i don´t use them i tried to disable the IPv6 but this didn´t have any effect.

Any ideas?

Thank you in advance! :-)

best regards

Stefan Rindler