PC turn off while playing game

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 Hamza -
Hi everyone, the title talk by itself but I will describe in details.
when I play a game (no matter the game) my computer turn off like I have no more power and I'm forced to turn off my power supplies and turn on again to be able to restart my PC.
- I already have have core temp in my pc
- the maximum temperature recorded in my pc is 35 C

my PC hardware are :
-motherboard : Sabertooth 990Fx/Gen3 R2.0
-CPU : AMD AMD FX-8350
-RAM : kingston hyperX 8gb
-Main HDD : Kingston SSD 64Gb
-Video card : AMD Radeon HD 7870
-Heatsink : Antec Kuhler 620
-Power supplier TR2 RX 750 W
-FAN : 2x 200 mm (one top, one front), 1 120mm back

I clean my computer every month.

if anyone have an idea why my computer turn off for no reason it would by great. The only thing I have in mind is my power supplies run out of power but I really doubt about it

thanks in advance

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Where is your computer when you play games?
You may unintentionally unplug it for a second with your feet. (happened to me, took me weeks to figure it out.)
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I fact my computer is over my desk I can't touch any power cord with my feet
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That would be kinda odd.
Have you changed anything on your computer? When did the problem started?
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The problem start 5 days after installing my new material (the items list in my post except RAM and power supplies) but during the first 4 days I've played game and everything was OK
Its because of overheat. You have to change your fan. Buy a cooling fan. That would help.
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I would guess that the problem is:

Video card : AMD Radeon HD 7870

Not suitable for the games you play
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Yeah sir. I think so. You can upgrade you processor sir.