To everyone who commented: I will investigate the voltages tomorrow, thanks for the comments. This E8400 even on the 680i i had, needed 1,42v (real) to be stable at this speed. I know it's a bit too much and the problem might be something else, but if i lower the voltage any further, the system just crashes after a few minutes Prime95.

Anyway and even if i'm fully watercooled, i'll try to lower them tomorrow as i said, bit tired today.