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PC rebooting while under load; suspecting PSU - help appreciated!


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4 replies to this topic

#1 allsilent

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Posted 06 July 2015 - 08:08 AM

Greetings!

Brand new here; I created this account basically to get some insight on this problem. Before you direct me to similar threads, know that I have read and reread everything that google returns when I search "PC reboots while playing games," many of those results coming from this site, and I think, maybe, that I have the answer, though I would greatly appreciate the opinions of you more-experienced individuals. I greatly appreciate any ideas you guys and gals have.

Quick problem summary: I built my PC about 3.5 years ago, and I use it as my daily driver, with a focus on gaming. I've upgraded it over time here and there, and it's always been wonderful. I am very meticulous when it comes to caring for it. Pertinent details as follows:

Intel Core i7-2600K 3.4 GHz (OC'd 4.43 GHz since I got it in 2011, no issues)
8 GB G. Skills Ripjaw X RAM 1600 MHz
1 TB HDD
2 TB HDD
250GB SSD
ASUS P8Z68-V PRO MB
Corsair H60 Hydro Cooler for CPU
EVGA GTX 570 HD SC (Recently upgraded to EVGA GTX 980 Ti SC+ ACX 2.0+)
Corsair TX850M Semi-Modular PSU (suspected culprit, read on)

As you can see, I recently traded out my aging GTX 570 for the almost-mac-daddy-of-them-all GTX 980 Ti, and, much to my delight, I began playing newer games on the maxed-out(ish) settings I used to enjoy back in 2011(ish) on many titles.

But recently new problems arose; my computer started hard-rebooting (no BSOD, no warning, imagine pulling the plug from the wall and then plugging it back in and pressing the power button to turn the PC on again) right in the middle of me playing the Witcher 3, which came free with my graphics card. Sometimes it doesn't happen, sometimes it happens within 1 hour of gameplay, and sometimes it takes almost 2 hours.

A quick google search revealed that plenty of people have had similar issues throughout the years, and it looks like the overwhelming majority of these issues relate to a dying PSU, if overheating isn't suspected. I don't suspect overheating, as my CPU holds at most 70C(ish) degrees under p95 stress testing (warm certainly, but not approaching throttling or emergency shutdown per Intel's specs), and the GPU holds the same when looping FireStrike or under similar load.

So I've ordered a new PSU, this time an EVGA fully modular 850-Watt G2. I'm hoping that takes care of my issue. However, I want to know, if at all possible, that the PSU is the issue, for two reasons. Firstly, I obviously want to make sure I've got this taken care of going forward, but also I'd just like to enhance my understanding of PC components and processes in general. You guys seem to know what's up, so perhaps you can put me at ease.

So I set up a test in which I ran a FireStrike Graphics Test for the GPU and a p95 blended stress test for the CPU and just left them going, while using HWinfo to log all the sensor details. Sure enough, the PC eventually did its weird thing and kicked completely off without warning. I then checked the log.

SO HERE'S THE QUESTION YOU'VE ALL BEEN WAITING FOR: from an electrical standpoint, if the PSU is dying, wouldn't I expect to see some indication in the voltage rails sensor readouts? I've included the excel file to which I dumped the sensor data for your review. Perhaps you guys see something that I don't, but right up until the computer failed, the PSU seemed to be holding the appropriate voltages. You can see that, at most, the 12V rail went down by 0.1v(ish) toward the end of it all.

Back in college, I majored in EE, so I understand that voltage =/= power =/= current (I don't use my schooling for my primary job, so I've pretty much forgotten the rest), but I do presume that if my PSU were failing under load, a voltage dip would be evident. No?

Also, how can a PSU "be dying?" Why does it work until it "can't take it anymore," and then have no problem booting back up and providing a lot of power again, even to the point of being able to run more stress tests for another half-hour?

Based on what you guys see, is there another problem I'm not considering? I notice my CPU gets 10's of Watts over TDP during these stress tests, but that's always been the case, ever since 2011. My computer sits on carpet, but I've got it up on wheels so that the PSU is sitting above the floor with some space, and again all seems well with the PC except for this particular problem. At this point I would really like some reassurance that it probably is the PSU, but I'm open to suggestions.

Thanks for the (long) read, and I appreciate your input!

https://docs.google.com/spreadsheets/d/1ahoXtBv00FLMItF-WCtj_xSIRIO8I95SdC3yuHXxUIE/edit?usp=sharing <-- Failure happens at the final row (or immediately after it, I suppose). The 40.05.0 time stamp.

Edit: I heard recently that maybe there was a time when Corsair PSUs in particular were known for bad capacitors. Any truth to that?

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#2 PeterMayson

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Posted 06 July 2015 - 11:01 AM

Well, usually dying PSU just switch off if there's any problems but in your case it just force a reboot the system. So could be a problem with a motherboard but if it reboots only during high load on video card, we are return back with a possible issue with PSU. Or something wrong with video card. Video card overheating usually gives a BSOD or just caused hang of the system. However, sometimes may just reboot the system.

 

Okay, back to PSU. It may get worse due to overheating under high load especially when much dust gets inside of case. Also, capacitors and other components may degrade over time and unable to give enough output power. Or again, some of components may fail in case of high loading and/or overheating.

 

So, when you will get your new PSU and replace the old one, you will see it was PSU failure or another component. I do hope another components in your PC are in good condition.



#3 HumanMincer

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Posted 01 August 2015 - 05:37 AM

Did the new psu end up fixing this?? I have a very similar system with basically the same problem. Im not sure if its a faulty psu or poor psu air intake from the bottom of the case

#4 allsilent

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Posted 01 August 2015 - 09:33 AM

Got a new power supply, have not had any issue since then. On most of the forums to which I posted this question, people agreed that the PSU was probably to blame. One person suggested that it was probably the primary caps that were degrading inside the PSU, and said he'd be shocked if a new one didn't resolve my issues. It seems to have worked!

#5 HumanMincer

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Posted 01 August 2015 - 10:03 AM

Ok thanks for the reply. I might see if i can raise my case off the desk more gor better psu intake..otherwise its a new psu for me




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