PC turn off itself while playing games and benchmarking only

[Rico Pratama]

A week ago my pc was still running fine. I still could play Insurgency, Dota 2, Rocket L, CSGO like usual.
However, around 3 days ago, my PC suddenly turned off itself when I start those games. 5 second in game and than boom, my PC turned off. I just got this pc around 3 months ago.

FX8350 (base clock speed) with stock fan
Power Color r9 280x
MSI 970 gaming
Cooler Master V750 80+ gold certified

Solution I've been tried :
1. Install malwarebytes to make sure it's not virus.
2. Clean install windows 8.1
3. Run Prime95 and Furmark to see if something wrong with my hardware
- 2 days ago my PC could run those benchmark perfectly fine. (with max temp 80 degree C)
- Now my pc can't keep up with those benchmark for even 1 minute.
4. Got latest software for my hardware

Something I've been noticed
1. My PC run for hours absolutely fine while browsing, watching youtube, anything but not game and benchmark
2. I logged my temp with coretemp and it shows +- 40 degrees C when PC turn off itself. So i tought it's not a overheating problem

Might it be the software or hardware issue?

Thank You very much for your help!

 

[Vetsku]

You should try reapplying your thermal paste and get an after market CPU cooler.

 

[Rico Pratama]

You should try reapplying your thermal paste and get an after market CPU cooler.

Thank you for answering!
But i don't think overheating is the problem because the temp doesn't even reach 60 when it's turn off itself. So i think it'll not solve the problem.

 

[Carbongrip]

It could be a power supply issue since it's happening when your cpu and gpu ramp up and require more power. If you have an extra psu I would try that. Power supplies do degrade over time which means there power output slowly diminishes.

 

[Rico Pratama]

It could be a power supply issue since it's happening when your cpu and gpu ramp up and require more power. If you have an extra psu I would try that. Power supplies do degrade over time which means there power output slowly diminishes.

Same as what i tought before. But my psu is a decent one with 80+ gold certified. Is it possible that my psu broken only after 3 months?

 

[Vetsku]

It could be a power supply issue since it's happening when your cpu and gpu ramp up and require more power. If you have an extra psu I would try that. Power supplies do degrade over time which means there power output slowly diminishes.

Same as what i tought before. But my psu is a decent one with 80+ gold certified. Is it possible that my psu broken only after 3 months?

Unlikely, but possible.

 

[GhislainG]

I helped another member who ran into a similar issue with the 650W version; test wih a different PSU to make sure it's the source of the issue. If it's stable with another quality PSU, then you'll know for sure the PSU is not up to the task.

 

[Carbongrip]

If you don't have a extra psu, then I suggest RMA of the power supply.

 

[GhislainG]

If you don't have a extra psu, then I suggest RMA of the power supply.

He may get the same unit back and not fixed, but that's a risk to take.

 

[Carbongrip]

If you don't have a extra psu, then I suggest RMA of the power supply.

He may get the same unit back and not fixed, but that's a risk to take.

true, if you have a best buy or pc world near you then you could get a corsair cx750m to test and then return it after you get your RMA.