Before installing this card (and change the switch), my network had a rate of 7MB / s (100Mbps). After installation, that has not been a problem, the flow of my network is down to 2Mb / s. I went in the NIC settings to enable "Jumbo frame"; otherwise difficult to go gigabit. After a few tries, since you can select multiple values and the highest is not necessarily the best, I set the jumbo frame to 5ko. Now my network runs at 20MB / s.
For information, the network adapter has been installed on an old PC with Windows XP. Network cables are "shielded Category 6" and through a D-Link Gigabit switch (purchased at Amazon!).
In conclusion, I am satisfied that my purchase. By cons, if we change the advanced settings on each PC (which I did some checking), I advise against it for IT novices.