Hi Rik,
I'm not sure about this, have you noticed, but when I tried to reconfigure with the 'configure assistant CD' supplied by the server I was given the oportunity to configure ethernet or the PCI card. Also, I've just had a look at the receipt that came with the PC, which was built for me, and it says; Net Card 10/100MB and Wireless Net Card 54 MPS PCI.
The actual model of the PCI is conceptronic C54Ri.
Apart from that I couldn't tell how the ethernet connection is provided.
Btw, the green lights on the PCI card still light up.
Cheers Rik
John