Recently I've been experiencing random shutdowns of my entire system exclusively while gaming. I would normally expect a B.S.O.D. from an unstable system, but, unfortunately, no screen appears. The only thing that happens is that the system restarts itself suddenly after two to three hours of gaming.
The strange thing is that the shutdowns only happen during gaming, but they never happen during stress tests or video conversions. It's just when I'm gaming. I was also unable to find any minidump files in the root Windows folder. The only symptom I get is a generic error log in the Event Viewer.
I have already tried some troubleshooting to narrow down the issue.
I verified that I have "Automatically Restart" turned off in System Properties > Startup and Recovery. I have Complete Memory Dump turned on in the same section, and I set the Page File to the level recommended by the Memory Dump setting.
Here's everything I've tried so far to troubleshoot:
1) Stress tested the entire system using OCCT. I ran the test for almost 2 hours, and I checked in periodically to ensure none of my components were overheating. The voltages from my power supply also looked correct on the 12V, 3V, and 5V rails (I saw a max of .03V deviation). I was able to game for about two hours until my system rebooted again. I can let the system sit and run video conversions in VidCoder X for about 10 or 12 hours without a crash.
2) Ran a full Windows Memory Diagnostic. I did the extended test with two passes. No errors.
3) Physically swapped RAM sticks and checked all connections to PSU, GPU, etc. Verified that PSU fan turns on. No dust inside PSU or GPU heat sink.
4) The system uses about 480W during a stress test of both the CPU and GPU. The most I see when gaming is somewhere around 400W.
5) CPU temp never exceeds 60C when gaming, but it maxed out at 75-80C on the stress test. The GPU maxes at about 79 or 80C, but I've had it running at that temperature before without an issue.
6) I did a complete reinstall of my Nvidia graphics drivers. I noticed that after uninstalling them, Windows reinstalled the originals without my consent. I had to disable the automatic driver download, kill all Nvidia processes, uninstall all Nvidia items in Programs, and uninstall the graphics card from Device Manager.
7) I reinstalled my graphics driver, but I left out the 3D Vision and the NVidia HD Audio drivers to see if it would make a difference. The reboot continues.
8) I updated to the latest BIOS and adjusted some settings. I disabled anti-surge support and the VFR for the Intel chip. Neither setting made a difference in the old BIOS or the newer BIOS versions. I disabled Fast Boot in the BIOS, and I also disabled Fast Startup in CP > HW&Sound > Power Options > System Settings.
9) These crashes didn't start until upgrading to Windows 10 from Windows 8.1. I was using Windows 10 for about a month or two before the crashes started. My system used Windows 8.1 for about 8 months without this type of crash happening.
10) I have an overclock on the chip to 4.6GHz, but when my system has crashed due to instability in the past (when testing the overclock), there was always a BSOD with a different error message than 41. Generally, it was a watchdog error or temperature. I'm using a closed water loop with push/pull fans.
11) I made sure that the outlet isn't resetting. I have a backup UPS attached to the computer, and I verified that the battery kicks in when I unplug from the outlet. The computer keeps running if I disconnect electrical power.
12) It's probably not the UPS resetting because it makes a series of beeps when it turns off and on. I only hear the beep from the motherboard speaker when my computer restarts.
If anyone has any suggestions on what else I can do to solve this, or if you know where I can go to get more information, I would really appreciate the help. I'm out of ideas on what else I can try to diagnose the problem because the error is really generic. At this point, I'm unsure whether it's my PSU, my GPU, Windows 10, or drivers. Any advice would be appreciated. Thank you for the help.
i7-4790K OC to 4.6GHz
Asus Maximus VII Formula
Corsair H110 (Push/Pull)
Corsair HX850W PSU
Corsair Dominator 8GB 2133MHz
EVGA GTX 780 SC
Creative SoundBlaster X-Fi Titanium
Crucial M4 SSD 512GB
Seagate 1TB SSHD
Western Digital Caviar Black 1TB HDD
ROG Front Base
Samsung Blu Ray Disc Drive
Acer XB270H GSync Monitor
CyberPower 1500VA (900W) AVR UPS