Graphics · critical

How to fixNVIDIA-NVLDDMKM-CRITICAL

NVIDIA kernel driver critical error (nvlddmkm)

What this error means

NVIDIA-NVLDDMKM-CRITICAL is a critical-severity graphics card (GPU) problem. A critical failure in the NVIDIA kernel-mode display driver (nvlddmkm.sys). This is more severe than a standard TDR event — the driver cannot recover and triggers a system BSOD. This commonly occurs with corrupt driver installations, hardware memory errors in VRAM, or PCIe power delivery issues. 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 3 complete
01DDU clean driver removal in Safe Mode

DDU clean driver removal in Safe Mode.

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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02Reseat PCIe power connectors

Reseat PCIe power connectors.

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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03Run OCCT VRAM stress test

Run OCCT VRAM stress test.

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

  • Corrupt NVIDIA driver installation
  • VRAM hardware fault
  • Inadequate PCIe power connector