Power supply · high

How to fix Power Sag System Freeze / Lockup

Error code: PSU_POWER_SAG_FREEZE

What this error means

The power supply unit voltage rails drop below the minimum safety threshold under sudden current transitions (transient power spikes), causing the CPU or GPU to freeze instantly without a Blue Screen.

Updated

Before you begin

Save open work and back up important files. Use instructions for your exact device and software version. If Windows cannot start, see the startup guide.

Work through these checks

0 of 2 complete
01Ensure separate dedicated PCIe power cables are plugged into the GPU
  1. Ensure separate dedicated PCIe power cables are plugged into the GPU
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

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02Replace the power supply unit with a high-quality unit containing robust capacitors
  1. Replace the power supply unit with a high-quality unit containing robust capacitors
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors

Possible causes

  • Degraded power supply capacitors
  • High GPU transient spikes (e.g. RTX 30/40 series spikes)
  • Loose ATX power connectors