I think the ram is not the problem because i tried 3 ram sets (ocz platinum 1800, ocz reaperx 1333 and gskill hz 1600) and the oc problem is the same.. until 400fsb is ok, after that is a pain in the ass!

After lots of days spent in the last months trying to tweak this i found something stable at 425FSB. If i increase 5MHz i'll get an error on the first test... same story that happened when i passed from 400 to 425 but this time i'm not lucky to find the good settings :\

I know that GTL's depends on the vFSB but i don't know how to find the good values for them (in "ps"). Same story for the cb/nb skews, i'm just trying lucky shots but with no success til now.