PowerColor Rx 480 8gb
Mobo - B75M-D3H rev 1.0 (with last bios update)
Win10 pro 64 bits
Cougar Cmx 850w (i think its 3 years old)
First my pc was getting hard crashes when playing Fallout 4 for 30min and other games (showing the last game frame and making a strange noise for a half sec and crashing the pc, needed manual reboot) on win 7using the last amd driver update with outdaded mobo bios(f12), then i made a win10 clean install, updated my bios and downloaded the crimson 16.7.1 driver. The hard crash were gone but now my pc reboot automatically(no error message on windows) when playing Gta v(for 2 hours), Warframe(5 min to 1 hour) and Paladins(3 hours only 1 time). Can it be my psu fault or my mobo is not good enough? or my gpu is broken....?
(my english is baaad)