Sudden system shutdown/restart, what could be causing it?

[Master]

Hello all,
I have been experienced 4 sudden shutdown/restart in the past month!
I have recently bought a new CPU (4790K) and updated my motherboard(Asus H87ME) to support that CPU.
and I dont remember any other changes that I have done except these two.
Initially I thought Maybe its because of the CPU overheating , which causes the system to restart suddenly, since I thought maybe playing RE7 with all settings maxed out, for about 15~30 minutes puts alot of stress on the newly acquired/installed CPU (i.e. 4790k). so I thought untill I get my hands on the aftermarket cooler, lets refrain from putting loads on it!.
To my surprise, system was restarted a few more times, when I was not playing, just running my tests which were mostly GPU extensive and not CPU extensive at all ( cpu temps were around 60~75 and rarely 80 at max)
This made me run RealTemp and log everything, after one of these crashes, I went to the logs and noticed the temps were all around 60, 70! (and gpu around 75, I have GTx980) ( I used 2 seconds interval to save logs).
Then I tried prime95 v28.9 (prime95v289.win64), and ran it for an hour and 08 (Its still being run!), temps reached 98, 99 on all cores and now they are between 90~99. and It has not crashed yet!!!

So What could be causing this sudden restart of the system ? Where what else should I look/poke into ?
Thanks in advance

 

[P4-630]

Could be a PSU problem.

 

[Master]

Could be a PSU problem.

How can I check that ?
PSU is 750watt , and its fan was spinning just fine!

 

[Ebo]

I would take a good hard look at your PSU.

1: Age
2: efficiency
3: Motherboard and see if any changes in volts(chipset, GFX, ram).

 

[EntropyZ]

How can I check that ?
PSU is 750watt , and its fan was spinning just fine!

I remember running OCCT software PSU stress test would would shut down PC pretty quickly after running on a power supply that's not up to par of what the system needs, especially if it is overclocked.

11v on 12v rail for me was pretty much the warning right there.

It might be that your power supply would only give out 750w at peaks, but not sustained and then the safety trips on the PSU.

As @Ebo said, check the power supply ratings which are on the label.

A restart makes me think something else might be an issue, because the system should shut off completely. I don't have much experience dealing with sudden restarts.

 

[P4-630]

How can I check that ?
PSU is 750watt , and its fan was spinning just fine!

Try another well known brand PSU, if you don't have another one to test, ask a friend's one.

 

[Liviu Cojocaru]

How many sticks of RAM do you have? Do you use XMP?

 

[Master]

I would take a good hard look at your PSU.

1: Age
2: efficiency
3: Motherboard and see if any changes in volts(chipset, GFX, ram).

I bought my PSU in less than a year ago, and here is its stats : Link Green GP700A-Power Supply , and never had such issues before . they all started happening after I installed my new CPU and updated my bios!

I actually saved the Open Hardware Monitor's log when I was running prime95, here it is : I dont know how else I could check for them?

 

[Master]

How many sticks of RAM do you have? Do you use XMP?

4. well I dont know! (I dont overclock by the way). two of them are 8gigs(1600) and the other two are 2Gig modules(1333) (all from Geil,

 

[Liviu Cojocaru]

Try and use only the 8Gig ones for some tests see if this fixes anything

 

[EntropyZ]

The power ratings on the PSU are illegible in the picture on their website, also I would consider Green a non-reputable brand, so no idea how good their PSU insides are. And there's no other information in English about it.

The specs seem to indicate that it should be fine. But I wonder what the power readings are when using software.

 

[Master]

The power ratings on the PSU are illegible in the picture on their website, also I would consider Green a non-reputable brand, so no idea how good their PSU insides are. And there's no information in English about it.

Actually it is, just scroll down you'll find everything in english

 

[EntropyZ]

Actually it is, just scroll down you'll find everything in english

I edited the post, I was trying to find other information about it. I think the only other option to find out if it's good is to check the PSU rail readings in software.

The numbers below on the site, I can almost guarantee is marketing and less truthful about the components inside.

Maybe there is another compatible BIOS you can try?

 

[Master]

I edited the post, I was trying to find other information about it. I think the only other option to find out if it's good is to check the PSU rail readings in software.

The numbers below on the site, I can almost guarantee is marketing and less truthful about the components inside.

Ok. which solftware should I use for that? I downloaded OCCT but its not clear how to get the needed info on psu!?

 

[EntropyZ]

How do these numbers appear for you when running on load?

 

[Master]

Thanks, here is my snapshot: (Seems not all the numbers are showing, so here is another one):

 

[EntropyZ]

I can't see anything other than the 3.3v rail. I wonder what that might mean. Though the histogram on the lower right I see 11.81. That might be your 12v rail, which is lower than exactly or higher than 12v. If the PSU can't supply good power, it will bring system instability and in rare cases sometimes even failure.

I wonder though how many watts you are pulling when the whole system is in load.

I have two Energon 750W units, which are supposed to be for "gaming" (big quotes there), and with one of them running the system with an FX-8350 & 560Ti would restart or shut off sometimes. Around 500W of total load, but the PSU would just die.

 

[Master]

I can't see anything other than the 3.3v rail. I wonder what that might mean. Though the histogram on the lower right I see 11.81. That might be your 12v rail, which is lower than exactly or higher than 12v. If the PSU can't supply good power, it will bring system instability and in rare cases sometimes even failure.

I wonder though how many watts you are pulling when the whole system is in load.

I have two Energon 750W units, which are supposed to be for "gaming" (big quotes there), and with one of them running the system with an FX-8350 & 560Ti would restart or shut off sometimes. Around 500W of total load, but the PSU would just die.

Check out the new screenshot, (updated the previous post)
Do you want me to run prime95 and get a screen shot again?

 

[laszlo]

+/- 5% at PSU current is not a problem -is in tolerances

knowing the exact time of shutdown you can check the event:

https://www.sevenforums.com/tutorials/160855-shut-down-view-details-last-shutdown-computer.html

 

[EntropyZ]

Check out the new screenshot, (updated the previous post)
Do you want me to run prime95 and get a screen shot again?

You can put some load on it, but I can see the lowest 12v is dropping quite a bit, I wonder how often does it happen. And yeah slight drops aren't detrimental so long as the PSU can keep it stable and not drop constantly to that point.

Would be nice if you just had another power supply to check with.

 

[Master]

You can put some load on it, but I can see the lowest 12v is dropping quite a bit, I wonder how often does it happen. And yeah slight drops aren't detrimental so long as the PSU can keep it stable and not drop constantly to that point.

Would be nice if you just had another power supply to check with.

any model would do ? or should I specifically get the same model with the same wattage and run the tests ?

 

[EntropyZ]

any model would do ? or should I specifically get the same model with the same wattage and run the tests ?

I mean you could do that, but I meant you trying the system with a power supply from a more reputable brand with the same wattage.

If the other PSU doesn't restart or shut off the system, you could blame the PSU to be a bad quality unit.

Also did you check the Windows Event Viewer and find anything out of the ordinary? Maybe it was a driver or a program causing the system to restart, but it would usually end up with a blue screen in that case.

 

[TheoneandonlyMrK]

Might be worth reseating some stuff , I've had my present rx480 do this , because of GPU swaps and cleans it's slots now shit so I have to have the card propped just so nowadays to get it working right , but to be honest it's sounding like a edgey PSU to me too except it restarting but to check this go into your bios and check to see what you have it set to do in a power loss situation, if it's set to reboot turn it off so after a power cut it stays off as this might be what's causing the reboot.
If so it better aligns as a PSU fault because as entropy says for PSU fails it should just shutdown.

 

[Master]

I mean you could do that, but I meant you trying the system with a power supply from a more reputable brand with the same wattage.

If the other PSU doesn't restart or shut off the system, you could blame the PSU to be a bad quality unit.

Also did you check the Windows Event Viewer and find anything out of the ordinary? Maybe it was a driver or a program causing the system to restart, but it would usually end up with a blue screen in that case.

OK. Thank you very much, I'll see what I can do .
and about the windows Event viewer, I checked that, but so far nothing useful. When this time it crashes I'll have a look at it instantly to see if I can get something out of it.


By the way, Thank you everyone as well, I really appreciate your time and kindness .
God bless you all

 

[Master]

Might be worth reseating some stuff , I've had my present rx480 do this , because of GPU swaps and cleans it's slots now shit so I have to have the card propped just so nowadays to get it working right , but to be honest it's sounding like a edgey PSU to me too except it restarting but to check this go into your bios and check to see what you have it set to do in a power loss situation, if it's set to reboot turn it off so after a power cut it stays off as this might be what's causing the reboot.
If so it better aligns as a PSU fault because as entropy says for PSU fails it should just shutdown.

I'll look into that as well, Thank you