Problem finally solved. Our machine is a one-CPU setup so PCIe slots on the bottom part of mother board is ignored. I only needed to place the card to an upper slot and now it's working like a charm. With regards, Gábor
Hi, We recently bought a supplementary ethernet card to our PowerEdge T620 server which is not recognized at all. It is not found by Linux OS and no trace in sys inventory as well. The card is well placed into the slot and looks alright, green LEDs blink at startup. Any help would be appreciated. Gábor 
Intel PRO/1000 PT Dual Port Ethernet card is not recognized by T620