PC restarts during gaming sessions (>5 hours)

2new

Prominent
May 13, 2017
2
0
510
Hey all.
I recently did my first build, but my problem is that my computer would suddenly restart during fairly long gaming sessions (> 5 hours). I read that it may be the fault of my PSU, but best to get an experts opinion first right?

Also, it was a budget build which then tweaked by changing the GPU. Also, I am running 4 fans (3x120mm, 1x200mm), so I don't believe inefficient air flow could be a problem.

Build:

GPU: Gigabyte 8GB R9 390 G1
MOBO: Gigabyte H170M-DS3H
CPU: Intel Core i5-6500
RAM: 8GB Corsair Vengeance
HDD: 1TB WD Black
PSU: Aerocool 80Plus Bronze KCAS 700W
Case: thermaltake chaser mk1

Any help would be greatly appreciated.
Thanks
 

2new

Prominent
May 13, 2017
2
0
510


Thank you, I appreciate the response. Should it be an 'immediate' 'ASAP', issue that I should be addressing, or is it alright to upgrade the PSU in the near future. (say in about 3-4 weeks).

Thanks