This is normal, since the cards default rate is 1gb. It can vary by manufacturer, on the same OS, Intel cards will show 1gb as a choice. Win2012 is the same way for bcom, no 1gb choice is available.  
Hi, My Dell Server (PowerEdge R720) running OS (Windows Server 2008 R2) is not showing 1 Gb Full Auto option in speed and duplex setting of any Ethernet card. Is it a default behavior or something I need to fix? All my other Dell Server Models (PowerEdge R710, R510, R410) are showing the option. Regards,Zain Khan
Speed and Duplex settings not showing 1 Gb full auto in Dell PowerEdge R720