The easiest way to tell the speed of the NIC's is by looking at the back of the appliance. There are two lights:
Right Light = yellow...flashing...port is active.
Left Light = Connection speed indicator.
Off = 10 Mbps or no connection
Green = 100 Mbps
Amber = 1 Gbps
The duplex is auto sensing and will vary depending on what the Gateway is connected to. At this time the duplex setting cannot be set/changed manually.