Onboard gigabit LAN not at full speed

[sswats]

I have a Gigabyte DS3p which should have gigabit lan onboard.
the driver in device manager is called Marvel Yukon gigabit controller.

but when i connect it up to my gigabit switch which has an LED for gigabit connection stays off, and just the normal LAN LED is on.

I go to device manager to change it to 1000mbps full duplex and that option is not there. 100mbps is the highest listed.

So how do I get it to run at full speed?

thanks

 

[sswats]

latest drivers, and about 2m

 

[sswats]

unmanaged cheapo one.
but my icy box NAS box which has gigabit interface is detected as gigabit.

using cat5e.

even when i left it to auto sense its not detected as a gigabit interface