CPU Stress Tests Cause Computer to restart When Stopped

[Greth]

Whenever I run a CPU stress test, it runs fine until I stop it, at which point my computer restarts. I have tried both the OCCT CPU test, and Prime95 SmallFFT. I have tested by using singular ram sticks and it still restarted with either of them. Everything is at stock with nothing overclocked.

I originally started testing because Helldivers 2 would restart my computer within a minute of getting into my ship (this was with the GPU installed), now it restarts right after I start the game.

 

I have tried reseating the CPU and it did nothing, I also checked and could not see any bent pins in the socket. 

 

Is this more likely to be a motherboard/cpu issue or a power supply issue?

 

My specs are:

• Windows 11 Pro 64-bit
• Asrock Z890 Pro-A Wifi (2.21, latest stable release)
• intel Core Ultra 7 265k
• 2x16GB Team Group T-CREATE Expert (currently on stock 4800MT/s)
• MSI Spatium Series M482 2TB SSD
• Seasonic G-Series 650w (from an old build, first time being used in ~5 years)
• ONIX ODYSSEY ARC B580 (currently completely removed from system)

[CatTNT]

disable iGPU (i think its an issue on intel 200 series?)  

update BIOS

 

check with different PSU

 

 

[SpookyCitrus]

Bios and drivers up to date? PSU could be a factor, though  you'd need a PSU tester or another unit to test in your system to confirm.

[MidnightStars]

Sounds like a voltage issue. Either your CPU is faulty due to the sudden drop in voltage (stock issues, or poor undervolt/overclock), or a failing PSU. My guess is on the later—try purchasing a new PSU and see if it fixes your issues.

[Greth]

 

33 minutes ago, MidnightStars said:

Sounds like a voltage issue. Either your CPU is faulty due to the sudden drop in voltage (stock issues, or poor undervolt/overclock), or a failing PSU. My guess is on the later—try purchasing a new PSU and see if it fixes your issues.

Thank you! I will try purchasing a new psu for now and see if that fixes it, I tried updating to the beta bios and disabling the igpu/putting the dgpu back in, but those didn't work.

[unclewebb]

@Greth

 

Use HWiNFO to see what the AC / DC loadline values are set to. Reducing these values can help reduce large changes in voltage going to the CPU when a full load stress test suddenly ends. I believe the default loadline values for both of these is still 1.10. I have an older 10th Gen system where I had to lower both loadline values to 0.25 mOhm. This finally stopped the full load to no load crashes. 

 

I also have an older Seasonic power supply. That might have been the source of the problem. Nice I did not have to spend money replacing it. I have been using it for years without any issues after the loadline adjustments. Watch the VCore voltage reported by HWiNFO for any spikes or drops when testing. 

 

No need to run a lengthy stress test. You probably only need to run Prime95 for about 15 seconds to get it up to full load. 

 

[Greth]

On 2/16/2025 at 1:54 AM, unclewebb said:

 

 

Use HWiNFO to see what the AC / DC loadline values are set to. Reducing these values can help reduce large changes in voltage going to the CPU when a full load stress test suddenly ends. I believe the default loadline values for both of these is still 1.10. I have an older 10th Gen system where I had to lower both loadline values to 0.25 mOhm. This finally stopped the full load to no load crashes. 

 

I also have an older Seasonic power supply. That might have been the source of the problem. Nice I did not have to spend money replacing it. I have been using it for years without any issues after the loadline adjustments. Watch the VCore voltage reported by HWiNFO for any spikes or drops when testing. 

 

No need to run a lengthy stress test. You probably only need to run Prime95 for about 15 seconds to get it up to full load. 

 

@unclewebb

Thanks! I found the setting, it seems to automatically be set to 0.76 mOhm, however, if I change the setting in the UEFI away from auto to anything in its accepted range, it gets pegged to 1.8 mOhm. I'm assuming there is some other setting I need to change or there is a bug in the beta UEFI, but I have not been able to find anything on it.