Thanks LSD, your settings worked fine and CPUTweaker showed correct values.

What concern me now is the "Round Trip Latency" I noticed that this value keep changing every time I reboot, sometimes it will be 51/51/54 and sometimes it will be 50/52/55, it is better to set it manually?

* I noticed in your screen, RTL is reporting 56 in bios and 55 in CPUTweaker, so I think your RTL is changing automatically too everytime