PC fails when stressed. Possible issues: power supply, motherboard, or processor.
PC fails when stressed. Possible issues: power supply, motherboard, or processor.
My computer shut down entirely during intense gaming sessions like Cyberpunk 2077, accompanied by a Kernel-Power 41 warning. Upon investigation, I noticed my previous PSU (NZXT C650, 650W) didn’t meet the needs of my i7-11700K with 4070 Ti Super (typically requiring 750W+). To give context: this machine has a track record of instability. For instance, I once attempted to install multiple RAM modules without realizing it would trigger issues, and experimented with overclocking. Back then, it would repeatedly crash until I reduced my RAM speed from 3200 MT/s to 2999 MT/s. It also failed during LLM training—could run for a few hours but would crash if Edge or other programs were active. I upgraded to a Corsair RM850e (850W) to resolve the problem. Initially, the system wouldn’t power on at all. After switching between old and new PSUs and eventually building the rig on cardboard, it finally booted and ran bench tests successfully. The next day, it crashed in Cinebench again. I reattached the PSU cables, and performance improved. But last night, after prolonged use (VSCode connected to a server and multiple Edge tabs), it crashed once more. When it does, it enters an on/off cycle for minutes before starting over after unplugging, discharging, and reconnecting. Motherboard: MSI Z590-A PRO with debug LEDs. The CPU LED illuminates during these failures. POST usually succeeds, but with the new PSU, I reached only the Windows login screen before it shut down again. Specifics: CPU: Intel i7-11700K RAM: 2× HyperX Fury 3200 MT/s Dual Channel (purchased separately) GPU: Gigabyte 4070 Ti Super 16GB OC Gaming Motherboard: MSI Z590-A PRO Cooling: NZXT Kraken AIO (model not remembered) PSU (old): NZXT C650 (650W, 80+ Gold) PSU (new): Corsair RM850e (850W, 80+ Gold, ATX 3.1) What I’ve tried so far: Checked RAM sticks individually—no difference. Windows Memory Diagnostic showed no errors. sfc /scannow reported no issues. HWiNFO data didn’t reveal clear faults, though readings might have been misinterpreted. Temperatures stayed below 70°C under load. Once, Dragon Age: Veilguard hit 100°C—a known bug I fixed by limiting CPU usage. Now I can run for hours, even in 2K with DLSS and Path Tracing, without issues. Still, crashes remain unpredictable. They often involve full shutdowns followed by cycles, with the CPU LED flashing. At this stage, I’m concerned it might be the motherboard’s VRMs or CPU power delivery failing. I trust the Corsair PSU is genuine, but I’m left with limited options beyond swapping to a different board or upgrading to a higher-end model. Any guidance on confirming whether the problem lies with the motherboard/CPU or if the PSU remains the culprit?
I believe the VRM might not be powerful enough for your CPU. Checking the power limit settings in BIOS and reducing them could improve stability. The MSI Z590-A Pro isn’t typically praised for strong VRMs with high-core Intel CPUs. If this isn’t the main issue, the next likely culprit is the RAM. Try disabling XMP and using JEDEC speeds to see if that resolves the problem. It’s possible your RAM requires more voltage to operate at its rated speed. To monitor power fluctuations, watch HWinfo for Vcore changes before crashes. This often points to weak VRM or a failing PSU—especially since you replaced the PSU. I recommend a budget bracket on AliExpress that allows mounting a 90-degree angled fan, helping circulate air to your VRMs. It could provide the extra cooling needed and might stabilize things. The bracket I found costs around six dollars and has already helped keep my overclocked RAM running smoothly.
In Event Viewer, are there just Kernel-Power 41 errors? Try starting in Safe Mode, run a stress test on the CPU, ensure you have the latest BIOS installed, and reset it. You might also consider undervolting the CPU using ThrottleStop to observe any improvements.
These issues indicate your PC wasn’t turned off correctly. It’s completely normal when the power supply stopped working before you could shut it down.