Hello,
 
The day I put the RTX card in my system I started experiencing reboots after ~10 minutes of gaming. This only occurred in certain games, some I could play for hours before reboot, some around 10 minutes. I reinstalled the graphics driver and lowered my CPU OC to 4.8Ghz@1.28v and I did not receive the crash anymore. To find out if it was the driver or OC causing the issue, I then reset my OC back to 4.9Ghz on the CPU. I continued to have no issues anymore, even gaming for 12 hours in a day. Things were good for 2 whole weeks of consistent gaming until I was playing Ark and got a Bad Pool Call BSOD(Apparently that BSOD crash is common for many ARK players). Once the computer rebooted, I then started to experience the Hard resets during the same games once again.
 
This time, I reset my OC back to 4.8Ghz@1.28v and continued to test. I still got hard resets, even tried reinstalling the latest driver. So naturally I returned the CPU OC to default and now I haven't had a reset in a few hour sessions of intense graphical games.
 
Most people seem to fix this issue with a new PSU, but everything worked fine for 2 weeks gaming 8-12 hrs a day after the initial resets were thought to be "fixed". Though, now after the mentioned BSOD I cant seem to play any of them for longer than a few minutes until a reset happens.
 
If my PSU was unstable, how would it have worked for 2 weeks after the first set of hard resets? Only for the problem to return after a BSOD crash? At this point, I'm not sure if it's a driver issue, defective card, or a bad PSU. I've run stress test on each of them and there are no issues. 
 
*Not sure if this is matters but ever since plugging in the RTX card, my bios splash screen and bios screen itself does not fit my display. Sometimes rarely when I reboot it will fit, but most reboots it is Overscanned and i cant see several inches on every side. This never happened with my GTX 1080 Ti in this rig, same TV and same cables. This rig is only 10 months old.
 
My specs are:
Intel® Core™ i7-8700K @4.9Ghz 1.31v (currently running at default speeds)
EVGA RTX 2080 Ti FTW3
16 GB [4 GB x4] DDR4-3200 Memory Module-GSKILL Ripjaws V
MSI Z370 GAMING PRO CARBON
850 Watt - Thermaltake Toughpower Grand RGB 850W Gold Full Modular
 

I do not get hard resets when CPU is set to default speeds, only when it is overclocked(even a tiny bit). The puzzling part is I had my CPU overclocked for weeks with no issues using the RTX card. The hard resets only returned after I got a BSOD when playing ARK. That is what threw me off and made me think it might not be the PSU.

Can upgrading the GPU make the OC unstable? I had the same OC profile for 10 months with my gtx 1080ti, passed every overnight stress tests I threw at it and never had a single issue gaming. Also, wouldn't I get different crash log results in Windows event? I only ever see Critical kernel power 41.
 
I don't mind running at stock speeds if it fixes the issue, or even creating a new profile and testing. Just curious for future reference. Thanks for the reply Sajin :)

I'll keep testing with a couple stress tests and longer gaming sessions. Hopefully that's all it is.
 
Just odd that the RTX card and the OC on the CPU worked fine together for weeks even through several stress tests and many hours of gaming. Now it cant even run a few minutes without resetting on that same OC profile.

Good to know. I am running every game in 4k. Most of the time, hardware monitor shows my cpu utilization is around 40-60% for my demanding games.

I looked through the event logs from the time and date of my last crash and all I can find is Kernel-Power 41.
"The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly."
 
Will continue to keep an eye out for that error throughout the logs though.

I read a forum that mentioned precision x1 as well, so I definitely tried that a few days ago. It still reset with a fresh install while my OC profile was active. However, it seems to be fine now that I removed the OC profile I had been using the past 10 months with my gtx 1080ti. With everything running at default speeds I haven't yet ran into a hard reset under load.
 
The thing I'm trying to figure out now is why I can't seem to find a stable OC anymore. Even a tiny OC on the CPU of +.1Ghz causes hard resets, no matter how much voltage I give it. It seems to only like default speeds, and my kill a watt meter says I'm only drawing 350-385 watts from the wall during heavy load. So I should have plenty of headroom. I guess it could be an amps thing, and not wattage.

I'll start swapping out parts soon to see if I can fix the issue. I suppose process of elimination will be the strategy here. It may take me some time to get it all done, but I'll return with my results or if anything new happens during the process.
 
Thanks everyone for the help.

I had the same issue. It was my PSU.

bjepsen88
Finally had time to troubleshoot again and I did actually solve the issue.
 
I had requested an RMA for the 2080ti ftw3 and once the new one came in, I swapped them out. Ever since I have had no reboots during gaming. I've been stressing the card by games and tests for a week now with very long 16-24hr sessions and not a single reboot.