PC restarting mystery

p3ep90

Distinguished
Mar 22, 2014
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Hi guys

My pc keeps restarting without bsod or warnings whenever it is on moderate to heavy load, which is gaming in my case. Sometimes it lasts for couple of hours before restarting but most of the time its within a few mins of starting a game.
My machine is self assembled, about 9 months old and consists of following components :
CPU - AMD FX-6300
Mobo - Gigabyte GA-970A-D3P M
RAM - Corsair Vengeance 4GB x 2
GPU - Sapphire radeon 7770 HD
PSU - Corsair VS550
HDD - WD Black 1TB

I would like to mention things i've already tried :
1. Checked the temperatures for both cpu and gpu, which was ranging between 38C to 65C(i live in a hot climate)
2. Removed. cleaned and swapped the RAM sticks.
3. Defragmented and CHKDSK the HDD.
4. Remove the chasis from the multiplug and put it into a wall socket directly.
5. Cleaned and re-applied the thermal compound on CPU and GPU.

Next thing i could think of is to somehow check the PSU but i do not know how to do it. Also please dont suggest to replace the PSU with another one and test run it because i cannot get my hands on any other PSU for testing purposes, although i would replace it with a new one if i can be sure it is the source of the problem. Also i cannot swap my graphics card with another one for testing purposes for the same reason.

My chasis is NOT EARTHED, could it be the problem? But my old pc was running like this for years, and this one too for around 8-9 months.
 

p3ep90

Distinguished
Mar 22, 2014
25
1
18,535


Thanks for the reply, but i am still confused. How can heat causing it to restart when it did not happen at the peak summer time? Now temps are dropping at my surroundings since its arrival of winter.
Also do suggest a good cooler for my CPU, i am running stock atm.

Another question, will my PSU support an upgrade of gtx960 2gb over my current 7770HD.