Power supply · high

How to fixPSU_POWER_SAG_FREEZE

Power Sag System Freeze / Lockup

What this error means

Power Sag System Freeze / Lockup ranks as a high-severity power supply unit (PSU) issue in our database. 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. Follow the steps below to fix it.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 2 complete
01Ensure separate dedicated PCIe power cables are plugged into the GPU

Ensure separate dedicated PCIe power cables are plugged into the GPU.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Replace the power supply unit with a high-quality unit containing robust capacitors

Replace the power supply unit with a high-quality unit containing robust capacitors.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

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