Bios updated helped after all. I tested few times with default OC settings before updating bios and it didn't die, no BSODs, but the temperatures reached 100* instantly. So I've finally updated bios and it doesn't BSOD, temps are around 80* , renders fine. PC is unusable at the time. Mouse responds to movement after 10 sec. not ideal but i don't mind that , as long as no BSODs will happen.
Thanks for suggesting this MASH.