Reboot after installing AMD FX8350 - what's the problem?

Question

AMD

I recently upgraded my processor. Instead of AMD Phenom II X6 1090T, I installed AMD FX8350. Motherboard Gigabyte GA-990FXA-UD3 rev 1.0. Thermalright Macho Rev A cooler.
Computer boots up, everything works fine. At first I did not notice any problems. I started to drive away stress with the OSST test - reboot after 4-8 minutes. Overheating, judging by AIDA64 and HWMonitor, no. The temperature does not exceed 60 degrees on the processor. In games, the processor behaves well, everything goes smoothly. When playing GTA 5, the computer rebooted after 1-1.5 hours of play. Before that, there were no reboots on the phenomenon. What can be wrong? The bios on the board has been updated to version F9. I tried it on the F10 beta - everything is the same.
Other specs:
PSU: Corsair CX750M
Memory: Corsair 2 sticks, 4 GB, 1333 MHz

Answer 1

If there was overclocking, then try lowering the processor voltage. If not, try anyway.)