PC restarts under heavy load.

[Robert4225]

Hello everyone!

The components of my PC:
Asus sabertooth Z97 mark 2 motherboard
Intel core i7 4790k CPU /base clock speed/
2x8 Gb Corsair dominator platinum 2400 MHz C11 memories /2133 MHz at the moment/
Asus strix GTX1070 O8G GPU
Corsair RM850X PSU
1TB WD blue HDD
120Gb Corsair SSD

A few weeks ago i bought an EKWB p360 water cooling kit, a GPU water block, and an extra 240mm rad, to have good temps on my CPU and GPU as well.

(Before i installed the water cooling everything was fine even under heavy loads)

But after that, my pc didn't want to work, restarted under load (no blue screen no lags nonthing, just a restart) even if i played LOL.

After this i wasnt able to start my pc i didnt boot, black screen, no bios, nothing. Only CPU fans were spinning. Then i disconnect the Corsair PSU, and put another one (Artic 750W Modular PSU OEM) into my pc, but with this one, the pc didn't even start.... (i was using this PSU when i was waiting for the Corsar one and it was fine). I checked and realized the Artic PSU is dead 🙁... I don't know how it can happen cause last time i used it, it was ok...
I was so dissapointed, but as a last try i put back the Corsair PSU into my PC and it booted normally....

I connected EK and they said i didn't applied the water block on the GPU porperly, so the mosfets were overheating. I applied the VGA block again with new thermal pads and thermal paste (12W/mK thermal pads, and Arctic freeze MX4 compund, both are very good quality ones). Temps were fine, no air bubbles in the cooling system, but the problem was the same.

And to start the PC again, i switched the 2 PSU-s, Artic one still dead my pc didnn't even start with it... but when i put back the Corsair my PC booted again, so i started to look after another solution. I didnt blame the water cooling anymore.


I was searching on some forums, and some users had problems with ASUS GPU tweak and AI suite (sometimes GPU twek in auto OC mode overcloks the GPU VRM-s too much and that cause a problem and a sfety shutdown to save the GPU, specially when the GPU core temps are very low), so i uninstalled them. I am using MSI afterburner because after the forums its better, and ther is no AI suite on my pc. I reinstalled all the nvidia drivers as well.

After this reinstall, my pc seemed to be fine, i was able to play LOL for hours without any problem.
I was sooo happy.... BUT

Yesterday i installed Far Cry Primal, i started to play, everything was ok, high settings, no laggs. So i thought it should be fine now.

After 20 minuntes, my pc restarted again... same: no bios, only black screen. Before the restart there wasnt any lagg just restart and thats it. Only CPU fans were spinning.

But it was different, because this time i get fed up whit this, and just turned off my PC without touching any components.

Today i came home and without doing anything i just powered it up, and it's working fine, i played LOL. As a last chance i tried Fac Cry Primal again and.... same PC restarted, black screen

If i am just using Chrome, or watching movies, or doing anything what is not "power" hungry my PC works fine.

My PC is 2 years old, except the Strix 1070 (i bought it last october-november), and the PSU, because my old one (Corsair maybe RM650 i dont remember) suddenly died after 1 year...

I hope It's the PSU because i lost the warrany for the GPU after i removed the original heatsink.


I hope these are enough details.

Thank you for the help, and sorry for the long thread.


Robert H.

 

[n0ns3ns3]

it's definitely something in your system.
What i'd suggest is to install HWInfo64 that allows to monitor temperatures, voltages and load of many components.
I suspect you MB has a VRM thermal sensor.
now do a simple test.
run prime95 version 26.6 on any of the torture tests. it puts load only on CPU.
if your computer can run few hours, it's not the CPU or MB.
then run heaven benchmark - it is very easy on CPU but puts significant load on the GPU.

Post results here.

 

[Robert4225]

it's definitely something in your system.
What i'd suggest is to install HWInfo64 that allows to monitor temperatures, voltages and load of many components.
I suspect you MB has a VRM thermal sensor.
now do a simple test.
run prime95 version 26.6 on any of the torture tests. it puts load only on CPU.
if your computer can run few hours, it's not the CPU or MB.
then run heaven benchmark - it is very easy on CPU but puts significant load on the GPU.

Post results here.

Okay i will be able to do it next week.

Thanks for the information

 

[Robert4225]

The problem was the PSU.... in 1,5 year 2 brand new corsair PSU died in my PC an RM650 after 1 year, and an RM850x after 6 months.... i found on the web Corsair RM series PSUs are very bad pick for that high price.... I bought a Cooler Master V850 PSU, and my pc is stabile even with the OC, and under heavy load... I don't suggest any of u who read this thread to buy any Corsair RM series PSU, HX and AX series maybe fine, but i will never buy Corsair PSU again. Anyway i love their products.

n0ns3ns3: I saw you have and RM650 PSU and im happy if that works fine in your build, but it was a bad pick for me....

Thanks for the help!

 

[n0ns3ns3]

Well, I have HX520 for about a decade. It was used in my main system for 7-8 years. Still works fine in secondary/spare/test rig. It was replaced with the RM650 couple of years ago since my system was heavily overclocked and sipping way over 400watts under some synthetic loads and at some point started to spontaneously to reboot. I assumed that it was the PSU (I was looking for a reason to get new one with 0 RPM fan mode), but eventually it was a power cable issue
the RM650 serves me great - quite stable power. it was handling quite nicely the older config with those (i suspect 450+ watts). in the the upgraded one, the power consumption went down by about 100 watt (due to change from 250w GTX 570 to 150w GTX 1070), so while gaming the PSU fan does not even spin. I do thing that there is some issue with the 24pin cable (either the cable or connection to the PSU is bad). if I mess with cables when system is turned on, I can get a reboot with "anti-surge protection" message after.
Unfortunately, XFX and EVGA PSUs are not sold in my country (as well as many other things), so my choice is kinda limited.