Mates, I think I've found the problem...
My Batch num: L707A409

Some comments about this Batch:
http://www.tomshardware.co.uk/forum/...-11-2ghz-e6600
http://www.xtremesystems.org/forums/...d.php?t=147041
http://forums.hexus.net/abit-care-he...gt-bugged.html

Yes, I'm unlucky! This batch gets poor OC's
I'm going to set the cpu @ 3.0Mhz and maybe after Xmas I'll order a newest CPU. What about a Q6600? xD