Issue Gigabit LAN R66U

[shooter40sw]

Hi guys, I got an Intel Motherboard with gigabit LAN, in the system tools of the it says 1000 Full Duplex, I got another PC all in one brand Siragon it says it has a jmicron pci express gigabit lan, when I connect it to the Asus router and it only gives me 100 Full Duplex, I thought it could be software error of Windows 8 or drivers but there is no issue there, I could force on windows properties the 1Gb Full Duplex but the router still gives me 100 Full D. on furhter tests I connected the cable UTP cat 6. and with 5e also directly to the Intel board and gave me the 1Gb Speed, so the problem is in the router, anyway to force the router to give me the full 1000 F.D What could be the issue? I also chaged ports on the router...
I got Merlin latest build 30_2
Thanks for the help

 

[RMerlin]

Don't force it to any rates. You will need both ends to be left at auto-negotiate.

 

[shooter40sw]

Hi merlín first it was and is auto negotiate I tried to force when it would not go to 1000 , in auto it goes to 100, I can force it to 10 and the router will show me 10 but if force to 1gb the router will stay in 100 and in auto the same result . if I leave it auto and connect to another board an Intel it will auto to 1 gb