I installed this NIC on my PC with windows XP and a Asus A7V8X-X motherboard. It worked fine with a 100Mb/s router but when connected to a 1Gb/s switch a "network cable unplugged" message is shown. The only way to get this NIC working is to change from AutoSense to 1000Mb/s (or viceversa) in the configuration window and restart the driver. Also unplugging and plugging several times the ethernet cable sometimes wakes up the card.
I tried with a different cable, I tried another switch, I tried the same card under Linux Ubuntu: nothing! I tried this card on another (newer) PC: nothing!! The message "network cable unplugged" keeps appearing. I borrowed a Zyxel card and installed in my PC and everything was fine. No worth sending it back! Very disappointed indeed!!