My PC reboots randomly

[knightsrom]

Specs (Nothing overclocked, GPU&PSU are about 2 years old, the rest is over 5 years old) :
- I7 2600k
- Gigabyte Z68X-UD3-B3
- 8GB RAM ( x2 4gb G.skill ripjaws)
- EVGA SuperNOVA 650 G2 80 Plus Gold Rated
- GTX 980 TI 6GB SC+ GAMING ACX 2.0

The crashes happen in complete randomness, sometimes I can play heavy games for multiple games with no problems, and sometimes it would just reboot while internet browsing.
And the worst part is, they don't happen that frequent, so it's pretty hard to diagnose it with trail and error.

- I have already re-installed windows multiple times, formatted my hard disk, I even bought a brand new SSD and replaced my old HDD with it to ensure that nothing is wrong with it.
- I have tried using one RAM stick at a time, and I had it reboot on my with both of them.
- Checked my temperatures and everything falls in a decent range.
- Checked my voltages using HWMonitor and there were no significant voltage drops.

Now I just wanna know what next step to take, I'm considering just upgrading my CPU and motherboard, but I'm afraid that it have to do with the PSU.

Any help is appreciated, thanks a lot.

 

[cin19]

When the PC reboot again, then go to the event log viewer to check out there is any error or not, if there is the error showed up there, you may find what cause the PC reboot randomly. https://tzworks.net/prototype_page.php?proto_id=4

Also may test the RAM with MemTest86 https://www.memtest86.com/download.htm

And take the gtx980ti out, use onboard iGPU to run the PC for a while, just want to see the PC runs fine or not without the gtx980ti. In this way you may have idea the problem is from gtx980ti or PSU.

Try other GPU or PSU if you had.

 

[knightsrom]

When the PC reboot again, then go to the event log viewer to check out there is any error or not, if there is the error showed up there, you may find what cause the PC reboot randomly. https://tzworks.net/prototype_page.php?proto_id=4

Also may test the RAM with MemTest86 https://www.memtest86.com/download.htm

And take the gtx980ti out, use onboard iGPU to run the PC for a while, just want to see the PC runs fine or not without the gtx980ti. In this way you may have idea the problem is from gtx980ti or PSU.

Try other GPU or PSU if you had.

Thanks for your reply.
As for the event viewer, I've tried to do so multiple times, and it would only say something generic (reports a kernel power error, with absolutely no references to the cause).
And for the RAMs, I have tested them using MemTest86 already for a night (that was long time ago), and it was fine.

You actually made me remember to actually try a new component, I have an old GTX 550TI, so I plugged it in instead of the 980TI to see how it goes. Will follow up here on what happens since I have no clue where to go after that

Thanks again

 

[cin19]

Use the gtx 550ti, and check the MB BIOS to see it has the newer one or not. How to https://www.howtogeek.com/196916/how-to-check-your-bios-version-and-update-it/

Here is from your MB https://www.gigabyte.com/Motherboard/GA-Z68X-UD3-B3-rev-10#support-dl-bios
Note: I had the GA-Z68X-UD3P-B3, and I remember I can't install the UEFI BIOS version. So I don't know you can or can't install the UEFI BIOS too.

Also is the gtx980 ti new or used? Test it in other PC, just make sure it works fine or not.

 

[R_1]

My canned random reboot Rant
Random reboots are usually caused by the PSU, the RAM or software AND in that order of likely-hood.
PSU - If you can borrow/swap a PSU for testing. sibling/friend you can swap out the PSU and each system will be testing the other.
RAM - run the system with one stick of RAM see if stability returns if not Test all the RAM with memtest 86 for three passes or overnight. if you get no 0 errors after more than three passes the ram is good. with the random reboots I would suggest running this test after the PSU swap or after the PSU has been cleared.
Software - Drivers or other issues can cause reboots. Boot to a linux distro on a USB drive. mint linux will boot to memtest86. you can run the OS from the USB and await reboot.
end canned rant