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  Semi-Random Reboots 
 Date Written 
Thiago Prado Oct 05, 2015, 02:16pm EDT Report Abuse

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john albrich Oct 06, 2015, 08:29pm EDT Report Abuse
>> Re: Semi-Random Reboots
You might also consider monitoring and logging independent CPU, GPU, and RAM voltages and seeing how those change during operation. While these are derived from the PSU, the motherboard does have its own on-board voltage regulators. The on-board regulators could be defective outright, or they could be being negatively impacted by your observed PSU output variations. Programs like Open Hardware Monitor, speedfan, and so on may be help you obtain more details in your testing. Here are a couple links...there are other similar tools. Note that what works well on one motherboard may not work as well on a different brand. Some also provide a real-time logging ability while others do not offer data logging at all. (very nice open-development project)

There are some challenges here as well. The CPU and GPU voltages and/or clock frequencies may be actively controlled and varied depending on sub-system load/demand. It MAY be possible to turn-off this "eco-friendly" software function on some devices (like a graphic card). I've run into situations where just about every time someone tries to provide an "eco-friendly" power-management capability they screw it up in a MAJOR way. The notorious ones that come to mind are the histories of hard drive power-management screw-ups that cause errors and/or massive performance degradation. I would expect CPU/GPU "eco-friendly" features would have the same challenges.

In addition, the hardware/software monitoring sub-systems are not very granular, and they operate at low sample-rates. Thus, extremely fast variations (aka glitches, spikes) may not be "seen" by a voltage monitoring program. Thus, obtaining meaningful voltage data precisely at the time your system actually "re-boots" can be difficult to pin down. Most of these programs us a "sampling" method which may be measured in seconds, so that leaves a LOT of real-world gaps for missing real-time data. This sampling issue also applies to the software system-based PSU voltage monitors you've already reported. Just because the values reported SHOWED as "OK" during your entire test, doesn't guarantee they actually were "OK" for the entire test.

In addition, many of the reported values aren't even accurate to 2 decimal places let alone the 4 or 5 decimals a monitoring program may report. People succumb to the fallacy that a "digital value" is always the truth and always exact.

Thiago Prado Oct 07, 2015, 07:42pm EDT Report Abuse
>> Re: Semi-Random Reboots
Hi John, thanks for your answer. It gave me a few more ideas to try.

It will take a while until I can reproduce the problem with multiple scenarios while using one of the suggested tools, such as without the energy economy features, but I will post more information as soon as I have them. Maybe with your help we can unravel this mistery! :)


kOrny Oct 10, 2015, 02:28am EDT Report Abuse
>> Re: Semi-Random Reboots
It still sounds like overheating to me. I see what you have done already to troubleshoot.

Have you monitored the temperature of the CPU while playing the demanding games? Does your BIOS have a setting to protect the CPU if it reaches a certain temp?

Thiago Prado Oct 10, 2015, 03:25am EDT Report Abuse
>> Re: Semi-Random Reboots
Hi kOrny, thanks for your reply.

Yes, I have monitored all temperatures up to the point the pc reboots using open hardware monitor, as per John suggestion. Last reboot I monitored cpu temp was 52 degrees Celsius, motherboard was 32 Celsius, and gpu 43 Celsius. All seem well within normal operation temperatures, so assuming the temp readings are correct, I don't think it would be a temp problem.

I will post last monitored values soon, I just want to test with several configurations first.

And yes, my bios has several failsafes, including cpu overheat protection. Even though I know it is unwise,I have even tried disabling the temp protections in my bios to test, and it still rebooted.

One thing I noticed with another monitoring tool, is that there is a VIN4 voltage that oscilates like crazy (between 0.016v and 1.088v from one second to the next all the time). I didn't find much about what that is, some people suggests it's the cpu voltage. Maybe that indicates a problem with the psu or the processor itself?

Anyway, tomorrow a new psu arrives and I will make more tests and post the results. I am hoping it is the psu, although so far I have no clue to what it could really be.

Thanks for your reply, and please let me know if you have any more ideas.

Thiago Prado Oct 10, 2015, 04:02pm EDT Report Abuse
>> Re: Semi-Random Reboots

Thiago Prado Oct 15, 2015, 09:24pm EDT Report Abuse
>> Re: Semi-Random Reboots



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