Hello! We have a Dell R640 server with this NIC and a 10 Gb/s Cisco switch. We tried to connect these devices together and eventually ran into a problem. If we choose a maximum speed of 1 Gb/s per port, we will have a stable connection without problems at 1 Gb/s. However, if you select a speed of 25 GB / s in the driver settings (there are no other options), the link will fall. We need to establish a connection at a speed of 10Gb / s, which our switch supports. How can we solve this problem? Thanks in advance!