Po długiej i nierównej walce - wygrałem 🙂
Opiszę, bo może kiedyś ktoś będzie miał podobny przypadek i post pomoże mu go rozwiazać.
Ostatecznie przetestowałem niemal wszystkie podejrzane komponenty (pamięć - pojedyncze i razem, zasilacz, kartę graficzną...) - nic nie pomagało.
The last two things that I did, and after which the problem persists, it:
1. I have connected a Seagate 2TB HDD to SATA6G_5 and SSD Goodram to SATA6G_6 (formerly were SATA6G_7 and SATA6G_8). Optical drives were SATA6G_9 and SATA6G_10 - plugged them into SATA6G_7 and SATA6G_8)
2. I noticed that after inserting video card clasp at the end of the PCIe port does not close automatically (as it did in the previous MOBO) - I crowed her manually, protecting against possible ejection card.
Do not want to determine which of the surgery helped, but it helped.
1. Maybe not native ports do not like any of the drives of connected there before (maybe SSD) or native ports do not like optical drives. I know it's sick, but ... possible.
2. Maybe the graphics card after screwing the exact losing contact with pins at the end of the PCIe port because security is not fastened?
I restored after regaining stability OC settings and everything works as it should.
Thanks everyone for your help.