PC still rebooting randomly while gaming.

[chopinanopolis]

I've made multiple threads on this before, and here's another one. I'm loosing my mind. Short recap, since I built my PC in Feburary I've been getting random reboots, sometimes while gaming, a few times while downloading updates through game launchers specifically (this only happened while downloading BDO updates, and not consistently). The screen goes black, and my PC immediately reboots, no BSOD, no warning, nothing. Just running fine, then boom, reboot. Event Viewer always says,
"A fatal hardware error has occurred.

Reported by component: Processor Core
Error Source: Machine Check Exception
Error Type: Cache Hierarchy Error" with differing APIC ID's. It's the same error, every single time.

Specs:
GPU: Radeon 6650XT, CPU: Ryzen 5 5600, Motherboard: MSI B550M Pro-VDH (old mobo: ASRock B450M Pro4 R2.0), SSD: 1TB Lexar NM620 M.2, RAM: 32GB (4x8GB) Kingston FURY Beast, PSU: 700 Watt be quiet! System Power 9, OS: Windows 10 Pro

I'll try to list off what I've tried so far, I will definetly miss some things since I've been doing this for nearly a year now. New PSU, RMA'd CPU to AMD directly(new CPU), Different kits of RAM, Multiple Mobos, Bios updates, drivers deinstalled and reinstalled, driver updates, Peripheral changes (headset driver's had issues), Disabled Resizable BAR, different RAM speeds, removed extra standoff in case (I've since had two different mobos), disabled PBO, undervolted CPU, undervolted GPU, tried to RMA GPU but no issues were found(multiple times), tried installing drivers without AMD adrenalin edition but my PC didn't like that at all (can't remember if it immeditaely rebooted, or if it rebooted immediately when launching anything, it's probably been 6 months), basically changed every BIOs setting under the sun that could have anything to do with CPU or power delivery, changed powerplan, reinstalled windows, turned off auto updates, changed response cruves to the lowest it could go (i think it was the response curve, again, its been like 6 months.). Every stress test under the sun, multiple stress tests at once to rule out possiblePSU issues, even with the new one.

I don't know what to do. I've managed to kind of ignore the issue since I avoided playing games that would often cause reboots, or one specific modded map that would often cause crashes. The crashes aren't consistent at all either. I recently had an itch to play modded minecraft again after like 5 years, and now I've been getting the issue a lot again. Made a new world and after like 10minutes the reboot happened, this went on to happen a few times more, and then it ran perfectly fine for hours on end, and in singleplayer I haven't crashed since. But as soon as I try to join a multiplayer server, it reboots again after about 10 minutes. Not one single stress test for any component has caused this. CrystalDisk info doesn't show any issues either. I really don't want to spend over 100 euro on a PC repair service. Some games don't crash at all, when I still played BDO (Black Desert Online) I never got a single reboot in game, meanwhile Apex Legends used to crash at almost the exact same spot every single time, now that doesn't happen anymore. I'm stumped, other threads and posts across webistes say different things, from bios updates, and PSU issues to CPU problems, all which I've tried to remedy, but not one thing has helped. Temps are all fine too.

 

[izy]

At some point had a similar problem , from what i can tell the fix for me was Disabling Multi-Plane Overlay (MPO), i mostly did what u did and it didnt fixed the problem till i disabled MPO but i am not sure what exactly was the problem because at that point i changed the PSU and tested with different RAM and GPU + BIOS updates , (changed all power/PCIE cables) etc, disabled PBO and everything and it was still happening , for some reason after disabling MPO and updated the BIOS the problem was solved, im also using a lower (higher) CO that i used before , -20 instead of -25 but i tested with no CO when this was happening and it wasnt the problem, i could reproduce the reboot with OCCT 3D Adaptive test.
You can give it a try with disabling MPO but probably you should check cooling too, for me probably was a combination of things, i cant point to something specific other than MPO.

 

[chopinanopolis]

At some point had a similar problem , from what i can tell the fix for me was Disabling Multi-Plane Overlay (MPO), i mostly did what u did and it didnt fixed the problem till i disabled MPO but i am not sure what exactly was the problem because at that point i changed the PSU and tested with different RAM and GPU + BIOS updates , (changed all power/PCIE cables) etc, disabled PBO and everything and it was still happening , for some reason after disabling MPO and updated the BIOS the problem was solved, im also using a lower CO that i used before , -20 instead of -25 but i tested with no CO when this was happening and it wasnt the problem, i could reproduce the reboot with OCCT 3D Adaptive test.
You can give it a try with disabling MPO but probably you should check cooling too, for me probably was a combination of things, i cant point to something specific other than MPO.

I'll try disabling MPO, thank you. Temps are good, so it's definitely not overheating sadly

edit: disabling MPO sadly didn't change anything, it still reboots randomly

 

[izy]

I'll try disabling MPO, thank you. Temps are good, so it's definitely not overheating sadly

edit: disabling MPO sadly didn't change anything, it still reboots randomly

It was a long shot sadly it didnt work , try using OCCT and see in what load the computer reboots and go from there.
It seems that you changed mostly everything other than the GPU , you could try testing with another GPU.

 

[Kminek]

You was always trying 4x8 kits? Amd have problems with 4 ram sticks, it's almost impossible to have stable system with 4 ram sticks. If you replace 2 sticks and keep 2, pc is still unstable?