Receiving random poweroffs

[Saddy]

Good day,

 

Over the last week, my PC has randomly began to shut off peacefully (no fan ramps, warning, etc – as if it simply lost power yet the RGB of the MOBO stays on). 

 

My temperatures are good (~50°C cpu every time it shuts off), I CMOS'd and updated my BIOS (no overclock), swapped my PSU, etc.

 

The shutoffs happen quickly under stress (~30 seconds after running s-tui).

 

Any recommendations on what could be wrong? Thank you.

 

 

[chaotic kronos]

Swapped psu with what same wattage or with more . And what is your specs

[Saddy]

14 minutes ago, chaotic kronos said:

Swapped psu with what same wattage or with more . And what is your specs

My original PSU was 750W, my swapped one is 650W. 

I have an i7-8700k @ 3.7ghz with a Gigabyte Aurous 2080, 32gb Corsair DDR 4 3000mhz.  PCPartPicker places my wattage south of 400W.

[chaotic kronos]

1 minute ago, Saddy said:

My original PSU was 750W, my swapped one is 650W. 

I have an i7-8700k @ 3.7ghz with a Gigabyte Aurous 2080, 32gb Corsair DDR 4 3000mhz.  PCPartPicker places my wattage south of 400W.

Below 400 with 2080 are u sure about that

[Saddy]

10 minutes ago, chaotic kronos said:

Below 400 with 2080 are u sure about that

I believe so: https://pcpartpicker.com/list/8VfdGL

Regardless, shouldn't the 650W be more than enough for no overclock?

[IkeaGnome]

18 minutes ago, chaotic kronos said:

Below 400 with 2080 are u sure about that

226W worst case scenario with factory voltages for the 2080.

https://www.techpowerup.com/review/nvidia-geforce-rtx-2080-super-founders-edition/30.html

Depending on motherboard, 86w with stock clocks and voltage settings for 8700k.

https://www.anandtech.com/show/11859/the-anandtech-coffee-lake-review-8700k-and-8400-initial-numbers/5

226+86=312W. Add little things here and there, leave headroom and I could see 400W as a suggested with a GOOD power supply for that build. 

9 minutes ago, Saddy said:

I believe so: https://pcpartpicker.com/list/8VfdGL

Regardless, shouldn't the 650W be more than enough for no overclock?

What power supplies?

Does event viewer show any errors besides improper shut down when you start Windows back up?

[Saddy]

14 minutes ago, IkeaGnome said:

226W worst case scenario with factory voltages for the 2080.

https://www.techpowerup.com/review/nvidia-geforce-rtx-2080-super-founders-edition/30.html

Depending on motherboard, 86w with stock clocks and voltage settings for 8700k.

https://www.anandtech.com/show/11859/the-anandtech-coffee-lake-review-8700k-and-8400-initial-numbers/5

226+86=312W. Add little things here and there, leave headroom and I could see 400W as a suggested with a GOOD power supply for that build. 

What power supplies?

Does event viewer show any errors besides improper shut down when you start Windows back up?

The original PSU was a Coolermaster 750W. The swapped PSU is a GIGABYTE P650B (650W). 

 

I mostly use Linux, but I am also having the same issue on my VR/Windows partition. Window's event viewer shows a crtitical Kernel-Power error with the following description:

 The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.

I doubt that any logs from the actual crash exist as my drives don't unmount before shutoff (the computer turns off nearly instantly).

[Saddy]

I purchased a new Corsair 850W PSU and my system seems to be workingi fine now (10 minutes into the stress test). Thanks!