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Power going out randomly. culprit = GPU? or PSU? or..

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#1 therue


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Posted 24 January 2016 - 11:52 PM

system spec:
Windows 7 ultimate 64 bit
Motherboard: Asus Z87-A
Intel core i7-4770k 3.5 Ghz
PSU: Seasonic S12G 650W (80 Plus Gold)
GPU: Gigabyte Geforce gtx 780
RAM: G.SKILL Sniper Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 2400
Hard Drives: main with os: Samsung SSD 840 EVO 250GB
and 3 other hard drives for storage

Recently, my computer has been powering off randomly by itself, and it seems to have gotten worse the past 2 days.

Sometimes the computer will just power off like when your house loses electricity, no warning, just everything shuts down... then followed a reboot: (and here are the two different outcomes)

1. system reboots itself and everything is fine, and i can log back into windows and continue whatever i was doing and hope that it doesn't power off again.

2. system reboots with the system running, however, the monitor gets the no signal blank screen. when this happens, i'm forced to turn off the power and wait a good 5 min or so in order to get the monitor signal back.

The pattern seems kind of random also, sometimes it would be when i'm playing games, sometimes when i'm just browsing the internet and not doing any labor intensive stuff.

I have used hwmonitor to check the system, and the temperature for everything seems fine, except TMPIN4 and a few AUXTIN, which after some googling I think are things that I can ignore I believe.

I did run Prime95, which is a stress test application for CPU, and that ran fine, my hwmonitor shows my cpu usage at 100% and the system was perfectly fine.

Then, I ran this GPU stress test called FurMark, and as soon as I hit the button, my computer power offs immediately.

But is this a GPU problem? or a PSU problem? 'cuz I hear sometimes that the system powers off when components in the system are not getting the power they need and system power offs in order to avoid overheating or component failure.

How can i pinpoint the root causes of this issue I'm having?

Can someone help me run some tests? Let me know what i should run, and what information I should display for you guys.

also when i go to bios i noticed 2 fans in red:

CHA_FAN2 (This is the front fan of my CoolerMaster HAF932.. the big one situated in front of all the hard drives at the bottom of the case, used for drawing in cool air into the system)

CHA_FAN3 (this is the top fan of my CoolerMaster HAF932.. the bit one on top of the case used to blow out the hot air from the system)

both of these are around 450-530 RPM. and in BIOS the min limit is set to 600 I think.

not sure if this can be an indication for anything.

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#2 therue

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Posted 25 January 2016 - 12:04 AM

as soon as i click the FurMark GPU test button to run the stress test... the computer instantly loses powers and then tries for a restart.


is this the sign of a failing PSU?


Also, i've noticed that the computer is usually more stable in the daytime though not always, but the longer it stays on, the frequency of the random shutdown/restarts occurs, especially at night when the computer's been on for a while. and sometimes after the comptuer shutsdown and restarts, the monitor gets no signal sign, and some of the chassis fan stop spinning, and I would have to just leave the computer off for 5-10 min before the fans and monitor comes back on when i hit the power button.

Edited by therue, 25 January 2016 - 12:06 AM.

#3 therue

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Posted 25 January 2016 - 02:07 AM

i used the sniper elite benchmark this time because someone said furmark might not be 100% safe.
I was able to let the thing run its course until it's finished without the comptuer shutting down... however, if I try to alt+tab during the middle of it, then the computer immediately powers off for some reason.

i set the hwmonitor to record when the benchmark sniper elite was running, and here is the zip containing all the photos showing the graphs for everything.


#4 Ram4x4


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Posted 25 January 2016 - 02:35 PM

It sounds like the GPU is having issues.  650 watts is plenty of power for your hardware.


It is possible it is the PSU, but your issues seem to happen mostly with GPU related functions.


Do you have, or have access to another similar video card to test your system with?  Preferably another gtx 780, or even a step up from that.

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