PC Shuts down under heavy load/games

I recently upgraded my system from a 560ti to a 780ti. This issue has not occured at all with my previous GPU. My computer has stayed on for days at a time while running 2 VMs. This issue only occurs while running high end games and other intensive applications.

Temperatures seem all right. Under full load in OCCT, my CPU and Motherboard temps reached a maximum of 60 celcius, while my GPU never went over 80. However, after about 5 minutes in OCCT my PC began the shutdown process, closing applications, ending processes, etc. Generally when crashing, it begins to do this, and either shuts down properly all the way, or cuts power a few seconds in. I'm thinking my PSU is failing, since 850W@70A should be enough power, but I'm not sure.

System Specs:
Mobo: GA-Z68X-UD4-B3
PSU: Corsair AX850 850w gold
GPU: 780ti single, stock clock
CPU: Intel 3770k @ 3.5GHz
RAM: Corsair Vengeance 16gb
HDD: 7200RPM Western Digital 1.5tb
9 answers Last reply Best Answer
More about shuts heavy load games
  1. use this and see what it will report
  2. I downloaded and installed WhoCrashed, this was the response from the analysis.
    Crash dump directory: C:\Windows\Minidump

    Crash dumps are enabled on your computer.

    No valid crash dumps have been found in the directory specified
  3. what happens if you use the 780 ti in the other gpu slot .
  4. scout_03 said:
    what happens if you use the 780 ti in the other gpu slot .

    tried that, pc then refused to turn on. I also noticed that tapping the side of my pc turns it on. I just purchased a new 850w single rail psu for testing purposes, pc still shuts down. At this point, I'm lost. Maybe there's a motherboard contact issue? i just don't know.

    edit: it no longer just shuts down under load. it shuts down a short while after hitting the desktop.
  5. update: after closer inspection it turns out that i was missing three motherboard screws. computer seems to remain on at idle now. testing at high loads.
  6. Best answer
    you should check if there are not any of them between the board and case or any other metal part that could made short and blow the system do it a soon as you can.
  7. there aren't any, i think i've fixed my problems. if nothing else happens i'll select it as the answer.
  8. yep, pc has been running for 24+ hours without shutdown. Problem has been resolved by returning missing mounting screws on the Motherboard.
  9. great you lucky none of them where between the board and case .
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