Question R9 280x restarting while gaming

Feb 14, 2019
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After while in games pc just turnoff (restart) most the time in league of legend.When i underclock that give's me more time to play but still is restarting,i even turn of anti surge and windows (restart when crash) but still restating.

I'm assuming its psu or gpu but there is no way i can try cuz i need 750+w psu and i don't know anyone who have that much and i don't have gpu that's powerful so its can be used a second to do testing

I have :

Cpu : i5 2500 3.30 ghz

motherboard: asus H61M-k

Ram : 8 gb 1333mhz DDR3

psu: LC Power Metatron Prophecy LC8750II 750W

ssd: BIOSTAR S150-120G

pls can someone explain to me why is restarting...
 

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