Simple MVG 3770K
8G 1600 8,8,8,24 ram
Samsung Pro
7950 GPU

Has been either freezing, shutting down fast or stop code 9c. all result in not rebooting automatically. It can take from 5mins to 20 hours between failures

passed 20 x LinX, Passed 8 hours Memtest+ but still failing

overclocked on auto just to bump voltages: ran for 12 hours before failing

changed psu: still failing

Current test is same ram different slots.

Next test is different ram although it is just a punt.

I am feeling this is a hardware failure

Anyone want to suggest where to go next?