Sergio
As far as your OC tutorial is concerned, unfortunately for me it is no go. The PLL is a culprit. When on default and everything auto, in BIOS PLL shows 1.813-1.819. And it's stable up to 4.6 GHZ. To reach higher OC, I need to set PLL 1.81875 (it shows 1.829-1.832), meaningless the VCCSSA= VCCIO on auto or set to 1.100.
I think it is worth mentioning for everyone who has a crappy CPU sample as I have

One thing I noticed after switching to 1204 BIOS. In BIOS I have LN2 mode enabled. Shouldn't the jumper be responsible for this option to be enabled? Of course I didn't even touch the jumper...