1
Verify the likely cause
Test with a known-good ATX 3.x power supply of suitable capacity and use separate PCIe power leads instead of daisy chaining.
FULL AI ANALYSIS
PC randomly powers off only during GPU-heavy workloads
Generated Sep 7, 2026, 11:54:26 PM
Analysis summary
The reported behaviour is consistent with transient GPU power spikes trigger over-current protection in the aging power supply. The safest next step is to verify that hypothesis with a reversible test before making permanent configuration changes.
Possible causes
Transient GPU power spikes trigger over-current protection in the aging power supply.
82%A recent software, firmware or configuration change is exposing an existing compatibility issue.
38%Suggested fixes
2
Validate and monitor
Reproduce the issue once after the change, review relevant logs or metrics, and keep a rollback path until the system has remained stable.