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PC shuts down when under load, e.g. playing games rendering videos.

PC built in 2015 August
OS: Windows 10
Case: Define R5
Processor: Intel Xeon E3-1241V3 - 3.5 GHz
Processor cooler: NH U14S
Motherboard: MSI B85M-E43
GPU: SAPPHIRE NITRO Radeon™ R9 390 8G D5
SSD: 240GB SanDisk
HDD 1TB
RAM: Kingston ValueRAM (16GB) (2x8GB) 1333MHz DDR3
PSU: Corsair CX 750W Fully Wired 80+ Bronze Power Supply


I'm currently having issues with my PC when under high load. Playing games or rendering videos will make the computer turn off without any warning, then after a few seconds restart, like some kind of a power cut.

I recently ran GPU stresser and the same issue reoccurred. When I did the same thing with the CPU stresser it could handle the load. At first I thought it may of been the GPU so I sent that off to be repaired however after 3 days of running it there were no faults found.

I'm unsure what else it could be as the power supply has been tested with the volt metere (not under load) and it is not showing any signs of it not working as it should.

So I'm unsure what to do now. Should I buy a new PSU with more power as the GPU states on the box that it needs 750.

I also did notice somewhere on partpicker that the motherboard I had bought was not compatible with my processor but I'm not sure if that has anything to do with it as it has run for just about over 2 years.
Reply to madmanpops
11 answers Last reply Best Answer
More about shuts load playing games rendering videos
  1. Check your temps. Although restarting is not usual from a shutdown caused by high temperatures, unless maybe your motherboard is set to reboot after a power failure instead of turn off.

    ANyways, start with the obvious which is temperatures and work your way from there.
    Reply to gondo
  2. @gondo.

    Temps are normal when the shutdown occurs.
    Reply to madmanpops
  3. Do you have a less power hungry GPU laying around?

    It could be a sign that your PSU is dying.
    And it would be nice if you could try and old GPU with around half the total power draw over the R9 380 and see if you crash then.
    Reply to lumineZ
  4. I unfortunately don't as it's the first customized pc i ever built. :( i might go with the power suuply option and if it doesn't solve the issue ill return it to maplin. Any idea on which one to get with my specs?
    Reply to madmanpops
  5. I would not go under 550 watts for a single GPU setup
    And around 800 - 850 if you where running 2 GPU`s in crossfire.
    That is with your current setup of hardware in mind.

    And from what manufacturer? Just find one here: http://www.guru3d.com/articles-categories/psu-power-supply-units.html
    That has recived a thumbs up from him.
    Reply to lumineZ
  6. lumineZ said:
    I would not go under 550 watts for a single GPU setup
    And around 800 - 850 if you where running 2 GPU`s in crossfire.
    That is with your current setup of hardware in mind.

    And from what manufacturer? Just find one here: http://www.guru3d.com/articles-categories/psu-power-supply-units.html
    That has recived a thumbs up from him.


    Oh ok thanks. Was 750 an overkill for one gpu then? I only got 750 bronze because it said on the gpu box 750 recommended psu
    Reply to madmanpops
  7. Best answer
    I would say 600 watts is enough but to be totaly safe?
    Go 650 watts and up. Anything over 650 watts is overkill for that system but if you go for a more powerfull high end PSU now you can upgrade to an alot more powerfull system later and maybe you dont have to get yet a new PSU :)
    Reply to lumineZ
  8. Okay. Ill get a 650 watt tomorrow. Ill let you know if it fixes the situation
    Reply to madmanpops
  9. New GPUs use very little power. 550W is plenty for modern systems. Even with dual GPU 500W can be enough. Water cooling, pumps, etc... can eat some up though.

    Make sure you have enough watts, but that's it. Quality of the power supply is much more important than watts. As long as you have enough your fine. I've seen inferior power supplies refuse to boot a certain model of motherboard where better quality ones worked.
    Reply to gondo
  10. madmanpops
    Are you still having problems or did it fix it?
    Reply to lumineZ
  11. Sorry for the wait. Yes I managed to find the issue. After sending electronic parts back and forth, the issue was that the psu cable which fits in the Mobo became lose therefore when under load some pins didn't receive the power needed. beginner mistake -_-. Thanks for the help.
    Reply to madmanpops
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