Hi Im back and with really good news. Seems like having troubles only when I leave the voltage settings to auto, but when I pick them manually, no problems OCing Right now I have set like this for a 4.0Ghz but is not stable, I ran Prime with his last version and it throw me error after 5 minutes.

CPU V: +0.125
DDR V: +0.150
Chip V: +0.125
FSB V: +0.100
GTL 1: 0.63
GTL 2: 0.63
MCH: Auto
PLL: 1.6V

And the configuration was like this:
Ratio: x9.5
Count Retry: 3
FSB: 420
FSB Bsel: 1333
DRAM Freq: DDR2 1008Mhz
DDR2 Enhance: Auto

I havent touch any other settings atm, but I figure that I will increase some of chipset and fsb voltage and drop a little bit the multiplier and take up the FSB parameter.

If you have a good, not excesive config to reach a rock solid 4.0ghz 24/7 im all ears :P