Well.. been reading all these (lot of) posts for the last week, to learn something with you guys, and I did

I also flashed the bios to 0902, clear CMOS, end re-entered all the settings I had with bios 0803 (because loading saved profiles is not recommended), and everything is stable, just as it was with bios 0803.

My OC:

E8600 @ 4,4ghz 1.4v (not a good cpu from what I see in forums)
OCZ 2x2GB @ 1100 - 5-5-5-15 - 1:1 - PL9 - Moderate - DRAM Static Enabled
NB 1,49v