Question Sapphire r9 290 tri-x random restarts

Jun 25, 2019
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Hi there. Im new here so go easy on me.
Full specs:
Win 10
Case haf932
Ssd samsung evo 950
Psu corsair gs800
Gpu sapphire r9 290 tri-x 4gb
Cpu ryzen 5 1600
Mobo asus prime z370
Ddr4 corsair vengeance 2x 8gb 3000mhz

Until now i have been using benq monitor 60hz hd alongise 43inch tv. I added second monitor same model and after some time random restarts started.

II have checked psu with psu tester and the only abnormal thing is pg over 500 usually 570.

As for gpu never oc but one of the fans is not spinning. Recently cleaned and thermal paste changed. (after restarts occurred).

Tried already fresh win10 and newer driver and rolling back to old ones. When i unplug second monitor restarts are less frequent.

Not sure if gpu is getting faulty or psu. Unfortunately i dont have means to check it out with another gpu/psu.
Both parts are around 6years now.

Any advices and suggestions are welcome. Thanks
 
Jun 25, 2019
3
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10
Gs 800 is 800w and as I said at this moment i have no way to check it out with other parts. Im looking for some cheap gpu for test but it will take some time.
But thanks.
 
Jun 25, 2019
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Quick update. Im sure it is now gpu as i got black screen (monitor doesnt show "no signal") but pc keep working witout restarting.

EDIT
wierd thing happened when i long press power button display comes back before shutting down pc.