Processor · high

How to fixRING-BUS-FAIL

Loss of internal bus synchronization

What this error means

Loss of internal bus synchronization ranks as a high-severity processor (CPU) issue in our database. The bus connecting the cores inside the processor collapsed. The usual suspects are dried thermal paste, overclocking too aggressively, silicon degradation and weak power supply. Use the steps below to track down and fix the cause.

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
01Improve cooling and repast

Improve cooling and repast.

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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02Increase LLC (Load-Line Calibration) in BIOS

Increase LLC (Load-Line Calibration) in BIOS.

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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03Undervolting

Undervolting.

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

  • Dried thermal paste
  • Overclocking too aggressively
  • Silicon degradation
  • Weak power supply