Network Problem in Suse 8.1.

Dear All, Sorry for the bother but I've been fighting with network problems after installing Suse 8.1. I have a Dell workstation and the installation detects the network card being Dell 3c905C-TX/TX-M (Tornado) the problem is that the speed of the network is just impossibly slow (about 10000 times slower than in between other machines in the office). I tried by hand to choose other cards from the list in the YaST, 3c 90x, 3c 59x, 3c 509 and they either act as badly or not at all. The network card is fine, I boot in windows and it flies... but of course I don't want to use it....:-), Anyone out there has a suggestion?, Thanks a lot for your help! Yours, Luis