If you have the vcore set to auto, I hear it usually over volts it a bit.
Ilya, I would set yours back to default clocks on auto Vcore. then see what it runs under load for a vcore.
Then manually set the vcore to that in bios and bump your clocks up from there. once you see it get unstable, not post, hang what ever, bump the vcore on click at a time.