Both ends set to auto detect speed and duplex?
Your ISP decided to limit you?

So all you did was reinstall, with the same version?
Steve
Yes.
Tried the card in my desktop.
Port 1: 1000Mbit connection, 200Mbit measured
Port 2: 1000Mbit connection, 100Mbit measured
So the card is smoked, how it can indicate 1Gbit and deliver 100Mbit I don't know, probably firmware problems or a faulty circuit.
Checked the physical port, but no problems visible.
Warranty here we come!